JP3392160B2 - 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 vehicle headlight using a high-pressure discharge lamp such as a small metal halide lamp, which is used for starting a discharge lamp lighting device using a battery, for a momentary voltage fluctuation, and for light rising. It relates to power consumption control.

[0002]

2. Description of the Related Art In recent years, automobile headlights have been developed that use small metal halide lamps instead of halogen lamps. This headlamp has the function of starting a small metal halide lamp with an electronic lighting circuit to start the light at high speed.
Hereinafter, such a conventional discharge lamp lighting device will be described.

FIG. 8 shows a conventional discharge lamp lighting circuit. Figure 8
13 is a DC power supply, SW ₀ is a switch, and 14 is D
C / DC converter, 15 is a pulse applying circuit, 5 is a high pressure discharge lamp, 16 is a starting pulse generating circuit, and 17 is a lighting detection circuit. The operation of the conventional lighting device including the components shown in FIG. 8 will be described below with reference to the timing chart of FIG.

When the lighting command (1) is applied, the switch S
W ₀ operates and the DC power supply 13 operates as the DC / DC converter 1
4 and the starting pulse generating circuit 16. The start pulse generation circuit 16 intermittently generates a start pulse in synchronization with the lighting command, and the high voltage discharge lamp 5 is supplied through the pulse application circuit 15.
To start the lamp. After starting, the high-pressure discharge lamp 5 receives the power supply from the DC / DC converter 14 and keeps lighting with constant power. When the high pressure discharge lamp 5 is activated, the lighting detection circuit 17 operates and the operation of the start pulse generation circuit 16 is stopped.

When the above operation is performed, the DC power supply 1
When the lighting command (1) is input, the output current from 6 is
First, the starting pulse generating circuit 16 operates and a current I ₃ flows. If the high-pressure discharge lamp 5 starts while applying the starting pulse, DC
Power is supplied from the / DC converter 14, and a current I ₂ flows. When the application of the start pulse is stopped, the high pressure discharge lamp 5
When the lighting is not maintained and the lighting is not maintained, both I ₂ and I ₃ become zero, but when the lighting is maintained, I ₂ continuously flows. Also,
If the voltage of the DC power supply is momentarily lowered while the high pressure discharge lamp 5 is lit, the discharge cannot be maintained and the high pressure discharge lamp 5 is turned off. As a result, the current supplied from the DC power supply 13 has a waveform as shown by I ₁ in FIG.

[0006]

The first problem is that when a starting pulse is intermittently applied to the high-pressure discharge lamp at the time of starting and the high-pressure discharge lamp is lit at the time of applying the starting pulse, it is necessary to supply a lighting maintaining current. Therefore, the change in the current supplied from the DC power source is large, and the burden of the DC voltage is larger than that during stable lighting. As a result, a DC power supply with a large capacity is required in order to maintain stable lighting of the high-pressure discharge lamp at startup.

The second problem is that, in general, a direct current power source for automobiles is connected to other devices in addition to the headlamp, and the power source voltage fluctuates regardless of the headlamp load. In an automobile, the voltage generally drops extremely for about 0.1 to 0.2 seconds when the engine is started. Therefore, when the high pressure discharge lamp is lit,
When the output voltage of the DC power supply drops instantaneously, the high pressure discharge lamp 5 goes out. In order to prevent this extinction, it is necessary to set the lighting maintaining voltage of the discharge lamp lighting device low.

A third problem is that in a high pressure discharge lamp lighting device for a vehicle headlight, since the light output is rapidly raised after starting, it is necessary to forcibly supply a large amount of power to the high pressure discharge lamp after starting. It is designed, and as a result, it is necessary to supply current twice to 10 times as much as that during stable lighting for ten seconds after starting. For this reason, the load on the DC power source is heavy, and a DC power source with a large capacity is required in order to prevent a voltage drop.

When the voltage of the DC power source decreases, the lighting device operates at a constant power, so that the input current increases as the input voltage decreases, and as a result, the input voltage further decreases. As described above, the discharge lamp lighting device is greatly affected by the voltage fluctuation of the DC power supply, and there is a problem that the lighting cannot be maintained at the time of starting or the lamp goes out at the time of stable lighting.

In order to solve the above problems in the present invention, a rechargeable direct current auxiliary power source is provided in addition to the direct current main power source, and the direct current auxiliary power source is supplied depending on the output voltage of the direct current main power source and the power consumption of the discharge lamp lighting device. An object of the present invention is to provide a discharge lamp lighting device capable of reducing charge of electric power supply from a DC main power source by controlling charge / discharge.

[0011]

In order to solve the first problem, a discharge lamp lighting device of the present invention comprises a DC main power supply, a DC auxiliary power supply, and a switch connected to the DC main power supply and operated by a lighting command. , An input control means connected between the switch and the DC auxiliary power supply, a first output control means connected to the output of the DC auxiliary power supply and the output of the switch, and an output of the first output control means to an AC A DC / AC converter for conversion, a second output control means connected to the output of the DC auxiliary power supply, a pulse generation circuit connected to the second output control means, the DC / AC converter and a start pulse generation circuit. The connected pulse applying circuit, the high pressure discharge lamp connected to the pulse applying circuit, the lighting detection circuit for detecting the lighting state of the high pressure discharge lamp, the lighting command and the output of the lighting detection circuit, and the output Control means, and a charging and discharging control circuit for applying a control signal to the first output control means and the second output control section, in which so as to reduce the power supply load from the DC main power supply during startup.

In order to solve the second problem, the discharge lamp lighting device of the present invention comprises a DC main power supply, a DC auxiliary power supply, a switch connected to the DC main power supply and operated by a lighting command, the switch and the DC power supply. Input control means connected between the auxiliary power supply, first output control means connected to the output of the DC auxiliary power supply and the output of the switch, and a DC / AC converter for converting the output of the first output control means into AC. A starting pulse generating circuit connected to the output of the DC auxiliary power supply, a pulse applying circuit connected to the DC / AC converter and the starting pulse generating circuit, a high pressure discharge lamp connected to the pulse applying circuit, and a high voltage A lighting detection circuit for detecting the lighting state of a discharge lamp, and a charge / discharge control for receiving the outputs of the DC main power supply and the lighting detection circuit and applying a control signal to the input control means and the first output control means. And a circuit, in which so as to prevent extinction of the high-pressure discharge lamp according to the instantaneous voltage drop of the DC main power source during stable lighting.

In order to solve the third problem, the discharge lamp lighting device of the present invention comprises a DC main power supply, a DC auxiliary power supply, a switch connected to the DC main power supply and operated by a lighting command, the switch and the DC power supply. Input control means connected between the auxiliary power supply, first output control means connected to the output of the DC auxiliary power supply and the output of the switch, and a DC / AC converter for converting the output of the first output control means into AC. A starting pulse generating circuit connected to the output of the DC auxiliary power supply, a pulse applying circuit connected to the DC / AC converter and the starting pulse generating circuit, a high pressure discharge lamp connected to the pulse applying circuit, and a high voltage A lighting detection circuit for detecting a lighting state of the discharge lamp; a charging / discharging control circuit for receiving a lighting command and an output of the DC main power supply and applying a control signal to the input control means and the first output control means. Provided, in which so as to reduce the power supply load from the DC main power source when the light rising immediately after starting.

[0014]

With respect to the first problem, when the starting pulse is not generated, the charging current is supplied to the DC auxiliary power source through the input control means,
At the same time, the first output control means and the second output control means are shut off to suppress the discharge current from the DC auxiliary power supply. On the other hand, when the start pulse is generated, the charging current is suppressed by the input control means, the first output control means and the second output control means are operated, and the charge of the DC auxiliary power supply is applied to the start pulse generation circuit to generate the start pulse. Applied to the high pressure discharge lamp. Further, when the high-pressure discharge lamp is turned on, the power supply from the DC auxiliary power supply to the starting pulse generating circuit is cut off, and further the delay circuit in the charge / discharge control circuit is operated to delay the operation of the first output control means. Then, the residual charge of the DC auxiliary power supply is supplied to the DC / AC converter to ensure the lighting and maintenance of the high pressure discharge lamp.

As to the second problem, when the high-pressure discharge lamp is turned on and the output voltage of the DC main power supply instantaneously drops, the charging current from the input control means is cut off or suppressed, At the same time, the first output control means is operated to discharge the electric charge from the DC auxiliary power supply to the DC / AC converter and keep the high pressure discharge lamp lit without being affected by the voltage drop of the DC main power supply. Further, after the voltage of the DC main power supply is restored, the delay circuit in the charge / discharge control circuit is operated to delay the operation of the first output control means, and the power supply from the DC auxiliary power supply is continued to minimize the lighting device. Ensure that the high-pressure discharge lamp remains lit without lowering the operating voltage.

As for the third problem, when the output power of the DC main power supply increases and reaches a certain value or more at the light rising immediately after the start, the input control means charges the DC main power supply to the DC auxiliary power supply. The electric current is cut off or suppressed, the first output control means is operated, and the electric charge is DC / AC from the DC auxiliary power supply.
Let the converter discharge. Furthermore, the charging of the DC auxiliary power supply is completed within a certain period of time immediately after the lighting command, and then the charged electric charge is used to reduce the power supply load from the DC main power supply at the time of light rising.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a discharge lamp lighting device according to an embodiment of the present invention. In FIG. 1, 1 is a DC main power supply, SW ₀ is a switch connected to the DC main power supply and operated by a lighting command, 2 is a DC / DC converter connected to the output of the switch SW ₀ , 3 is a DC / DC converter 2
DC / AC converter that converts AC output to AC
A pulse applying circuit connected to the / AC converter 3, 5 is a high pressure discharge lamp connected to the pulse applying circuit 4, 6 is a DC auxiliary power supply, 7 is a starting pulse generating circuit connected to the output of the DC auxiliary power supply, and 8 is A charging / discharging control circuit for controlling charging / discharging of the DC auxiliary power supply 6, 9 is input control means connected between the switch SW ₀ and the input of the DC auxiliary power supply 6, 10 is SW ₀ and the DC auxiliary power supply 6 and DC / The first output control means connected between the input of the DC converter 2 and 11 is the second output control means connected between the DC auxiliary power supply 6 and the starting pulse generation circuit 7, and 12 is the high pressure discharge lamp 5. The charging / discharging control circuit 8 receives the lighting command (1) and the output of the lighting detection circuit 12, and detects the lighting state and stops the operation of the start pulse generation circuit 7. 1 output control means 10 and The two-output control means 11 is controlled to control the charging / discharging operation of the DC auxiliary power supply 6.

FIG. 2 is a block diagram showing a specific main configuration of FIG. 1, and a charge / discharge control circuit showing the operation of the discharge lamp lighting device at the time of starting and instantaneous voltage fluctuation for the first and second problems. 8 shows an example of No. 8. In FIG. 2, the input control means 9 is an example using a reverse blocking diode D3, a relay contact 9a (b contact) and a charging current control resistor R1, and the first output control means 10 is a reverse blocking diode D1.
An example using the D2 and the relay contact 10a (a contact) and an example using the relay contact 11a (a contact) in the second output control means 11 are shown. An example using a battery 6a as the DC auxiliary power source 6 is shown, and the input control means 9
Shows an example in which the charging current to the DC auxiliary power supply 6 is turned ON / OFF. The operation of the embodiment of FIG. 2 will be described with reference to the timing chart of FIG.

First, the operation at the time of starting will be described. When the lighting command (1) is input, the switch SW ₀ is closed and the DC main power supply 1 is applied to the lighting device in the subsequent stage. DC main power supply 1
Output is separated into two systems, one of which is the first output control means 1
It is applied to the DC / DC converter 2 via 0. The other is applied to the battery 6a in the DC auxiliary power supply 6 through the input control means 9. On the other hand, the lighting command (1) is supplied to the charge / discharge control circuit 8 at the same time as the supply to the switch SW ₀ .

Since the high pressure discharge lamp is not turned on at the time of starting, the lighting state signal (3) is not output from the lighting detection circuit 12. Therefore, the lighting command (1) is given to the AND gate 8
It is applied to the monostable multivibrator MM1 through g. The monostable multivibrator MM1 outputs a pulse having a pulse width τ ₀ in synchronization with the rising of the lighting command (1). This τ ₀ determines the maximum application time of the starting pulse to the high pressure discharge lamp 5. Monostable multivibrator MM1
The pulse is supplied from the AND gate 8h to the monostable multivibrator MM2, and the monostable multivibrator MM2 has a pulse (pulse width τ ₁ ) at its rising edge.
Is output. The inverted output bar Q of the monostable multivibrator MM2 is applied to the monostable multivibrator MM3 and outputs a pulse (pulse width τ ₂ ) at the rising edge thereof. Further, the inverted output of the monostable multivibrator MM3 is applied to the monostable multivibrator MM2 through the AND gate 8h, and oscillation is repeated while the output of the monostable multivibrator is present.

The output pulse of the monostable multivibrator MM3 turns on the transistor Q1 through the OR gates 8i and 8e and the resistor R3 to operate the relay RY1 (waveform (4) in FIG. 5). Further, the contact b 9a of the relay RY1
Are installed in the input control means 9 and the a-contacts 10a, 11a are installed in the first and second output control means 10, 11 to control the charging / discharging of the DC auxiliary power supply 6.

When the monostable multivibrator MM2 operates, the relay contact 9a in the input control means 9 is closed, and the charging current determined by the resistor R1 flows from the DC main power supply 1 to the battery 6a in the DC auxiliary power supply 6. At this time, the relay contact 10a in the first output control means 10 and the relay contact 11a in the second output control means 11 are opened, and the battery 6a is opened.
There is no discharge of charge from. That is, there is no supply current I ₃ from the DC main power supply 1 to the DC / DC converter 2, but there is a current I ₂ from the DC main power supply 1 to the battery 6a. Next, when the relay RY1 is operated, the relay contact 9a in the input control means 9 is opened, the charging current from the DC main power supply 1 to the battery 6a in the DC auxiliary power supply 6 is cut off, and the second output control means 11 is operated. The relay contact 11a is closed and power is supplied from the battery 6a to the starting pulse generating circuit 7 to start the starting pulse generating operation. That is, the supply current I ₃ from the DC main power supply 1 to the DC / DC converter 2 slightly flows in order to maintain the lighting of the high pressure discharge lamp 5. At this time, if the lighting cannot be maintained as in the first cycle of FIG. 5, the current I ₃ stops flowing midway. On the other hand, the current I ₂ from the DC main power supply 1 to the battery 6a is cut off, the starting pulse generating circuit operates only with the battery 6a, and the DC main power supply 1 is not used when the starting pulse is generated. Current I ₁ from the DC main power source 1 Therefore, in the peak value is suppressed as shown in I ₁ of FIG. 9, is shown in Figure 5, the variation is reduced.

Next, as in the second cycle of FIG. 5, if the high-pressure discharge lamp 5 is lit during the application of the starting pulse, the lighting detection circuit 12 outputs a lighting state signal (3), and at the rising edge thereof, monostable. The multivibrator MM4 operates. Whether or not the high-pressure discharge lamp 5 is turned on can be easily determined by measuring a decrease in lamp voltage and an increase in light output. The output (pulse width τ ₃ ) of the monostable multivibrator MM4 is OR
The gate 8i is OR-coupled with the output of the monostable multivibrator MM3 to operate the relay RY1. Where τ ₃
If τ ₂ is set, after the high-pressure discharge lamp 5 is turned on, the charging start timing of the battery 6a is delayed and the current of the DC main power supply 1 and the current from the battery 6a are set to DC as shown by the hatched portion in FIG. It can be supplied only to the / DC converter 2.
That is, the current I ₁ shown in FIG. 5 flows from the DC main power supply 1 and the DC main power supply 1 is started at the time of start-up in which the load current fluctuation is large.
The load can be reduced by reducing the change in the discharge current from.

Next, the operation when the power supply voltage drops instantaneously during stable lighting will be described with reference to the timing chart of FIG. The voltage of the DC main power supply 1 is applied to the charge / discharge control circuit 8 and supplied to the voltage comparators VC1 and VC2. At the time of stable lighting, the voltage of the DC main power supply 1 instantaneously decreases as shown in (5) of FIG.
When the above is reached, the voltage comparator VC1 and the voltage comparator VC
The output of the AND gate 8c obtained by AND-combining the outputs of 2 is
A pulse like (6) shown by the solid line in FIG. 6 is output.
The output of the AND gate 8c is AND-combined with the lighting state signal (3) from the lighting detection circuit 12 in the AND gate 8d. As a result, only when the high pressure discharge lamp 5 is lit,
The signal from the AND gate 8c passes through the AND gate 8d, the OR circuit 8e and the resistor R3, and the transistor Q1.
Is turned on to operate the relay RY1. Relay RY1
Is operated, the relay contact 9a (b) in the input control circuit 9
The contact) is cut off, and charging of the battery 6a from the DC main power supply 1 is stopped. At the same time, the relay contact 10a in the first output control means 10 operates, and the battery 6a drives the DC / DC
A voltage is supplied to the converter 2 to compensate for the input power drop due to the voltage drop of the DC main power supply 1. As a result, the DC / DC converter 2 continues to operate stably, and the high pressure discharge lamp 5 maintains lighting.

After that, when the output voltage of the DC main power supply 1 recovers, the first output control means 10 turns off and the battery 6a
To stop the power supply from the DC / DC converter 2 to the DC / DC converter 2 at the same time. Thus, during stable lighting, when the voltage of the DC main power supply 1 instantaneously drops, the high voltage discharge lamp 5 is stably maintained to be lit by supplementing the power from the battery 6a. Although FIG. 2 shows that the relay RY1 also operates the relay contact 11a in the second output control means 11, this operation is performed because the starting pulse generating circuit 12 is not operating during lighting. It does not affect the operation.

If a delay circuit 8m as shown in FIG. 2 is added to the output of the voltage comparator VC2, the voltage comparator VC2
As shown in FIG. 6, the output of the voltage comparator VC2 is the threshold voltage Th of the AND gate 8c.
Is delayed for τ ₅ until. As a result, even if the voltage of the DC main power supply 1 becomes higher than the reference voltage V ₁ , the power supply from the battery 6a to the DC / DC converter 2 is continued for a while, and when the voltage recovery of the DC main power supply 1 is slow. Therefore, the DC / DC converter 2 is reliably supplied with power from the battery 6a, and it is possible to ensure that the high-pressure discharge lamp 5 is kept lit.

FIG. 4 shows another embodiment of the input control means 9, which is a relay contact 9a and a charging current control resistor R1.
Instead of two, two charging control resistors R9 and R10 are connected in series, and one resistor (R9 in the embodiment) is provided with a relay contact 9a (b contact) in parallel. In FIG. 4, the charge current to the battery 6a is not set to zero, but is suppressed to a value that does not affect the operation, and the charge supply to the battery 6a can always be maintained.

FIG. 3 is a block diagram showing another specific main configuration of FIG. 1, showing an example of the charge / discharge control circuit 8 showing the operation at the light rising time immediately after the start for the third problem. Is. The operation of FIG. 3 will be described below with reference to the timing chart of FIG.

When the lighting command (1) is applied to the charge / discharge control circuit 8, the monostable multivibrator MM5 operates,
The non-inverting output Q turns on the transistor Q3 via the resistor R7.
Then, the relay RY3 is operated for τ ₆ shown in (7) of FIG. By this operation, the relay contact 9b in the input control means 9 operates, and the charging current is supplied from the DC main power supply 1 to the battery 6a to rapidly charge the battery 6a. After that, when the non-inverting output Q of the monostable multivibrator MM5 falls, the inverting output bar Q of the monostable multivibrator MM5 turns on the transistor Q4 via the resistor R8.
Then, the relay RY4 is operated to operate the second output control means 11
The inner relay contact 11a is turned on. As a result, the battery 6a is connected to the starting pulse generating circuit 7, and the high pressure discharge lamp 5 is connected.
To start. When the high-pressure discharge lamp 5 is started, an arc is formed and the discharge is maintained, after a certain time (τ _{8 in} FIG. 7),
Since the optical output of the high pressure discharge lamp 5 is rapidly raised from the DC main power supply 1 to the DC / DC converter 2, a large amount of power is supplied as shown in (8) of FIG. 7. That is, when the starting pulse generating circuit 7 is in operation, the current I ₄₁ shown by I ₄ in FIG. 7 is supplied from the battery 6a.

On the other hand, the charging / discharging control circuit 8 is supplied with an output voltage and an output current (supplied as a voltage drop of the resistor R5) from the DC main power supply 1 and converted into electric power by the multiplier MX.
The output of the multiplier MX is applied to the voltage comparator VC3 and compared with the reference voltage 8k. The voltage V ₃ of the reference voltage 8k is set to an intermediate value between the stable power and the startup power of the lighting device. When the power from the DC main power supply 1 becomes higher than the reference power supply V ₃ , the output of the voltage comparator VC3 is inverted, the transistor Q2 is turned on via the AND gate 8l and the resistor R6, and the relay RY2 is operated. As a result, the relay contact 10a in the first output control means 10 is turned on, and the battery 6a is connected to the DC / DC converter 2 in parallel with the DC main power supply 1. At this time, the monostable multivibrator MM5
Since the relay RY3 connected to the non-inverted output Q is OFF, the input control means 9 stops the charging operation for the battery 6a.

As time elapses after the start, (8) in FIG.
As shown in Fig. 7, when the power from the DC main power source 1 drops to the reference voltage V ₃ or less (after τ _{7 in} Fig. 7), the relay R
Y2 is turned off, the first output control means 10 is turned off,
The discharge from the battery 6a is cut off. During this period, the current indicated by I ₄₂ of I ₄ in FIG. 7 is DC / DC from the battery 6a.
Supplied to the converter. In this way, when the power supplied from the DC main power supply increases, the charging of the battery 6a is interrupted and the DC / DC converter 2 is supplied with electric power to reduce the burden on the DC main power supply at the time of light rise immediately after the start. Can be reduced.

Although FIG. 3 shows that the relay contact 11a in the second output control means 11 continues to be turned on during lighting, the starting pulse generating circuit 12 is not operating during lighting. This operation does not affect the above operation. Also, in FIG. 3, the monostable multivibrator MM
The inverted output bar Q of No. 5 is input to the relay RY2 via the AND gate 8l and the resistor R6. This is to prevent the first output control means 10 from operating while the input control means 9 is operating. is there. Further, instead of the non-inverted output Q of the monostable multivibrator MM5, the input of the resistor R7 is changed to the output of the voltage comparator VC3 (ON / OFF with 10a in FIG. 7).
If the signal is the opposite, the relay contact 9
The battery 6a can be charged by turning on b.

In the embodiment, the DC / DC converter 2 and the DC / AC converter are combined to apply a starting pulse to light the high pressure discharge lamp.
The same effect can be obtained for the method of using only the C / AC converter 3 and the method of starting using the resonance pulse. Further, although the battery 6a is used as the DC auxiliary power source, the same effect can be obtained by using a large capacity capacitor such as an electric double layer capacitor.

[0034]

As described above, according to the present invention, a DC main power supply, a DC auxiliary power supply, a switch connected to the DC main power supply and operated by a lighting command, and a switch connected between this switch and the DC auxiliary power supply. Input control means, first output control means connected to the output of the DC auxiliary power supply and the output of the switch, and DC / DC for converting the output of the first output control means into AC.
An AC converter, a second output control means connected to the output of the DC auxiliary power supply, a start pulse generation circuit connected to the second output control means, and a DC / AC converter and a start pulse generation circuit. A pulse applying circuit, a high-pressure discharge lamp connected to the pulse applying circuit, a lighting detection circuit for detecting a lighting state of the high-pressure discharge lamp, a lighting command, and an output of the lighting detection circuit, and the input control means, a first A charging / discharging control circuit for applying a control signal to the output control means and the second output control means is provided, and the charging / discharging control circuit controls charging / discharging of the DC auxiliary power supply. After that, by supplying power from the DC main power supply, the load of power supply from the DC main power supply at the time of starting is reduced.

Further, when the voltage of the DC main power supply drops, a charge / discharge control circuit for receiving the output of the DC main power supply and the output of the lighting detection circuit and applying a control signal to the input control means and the first output control means is provided. By shutting off charging to the DC main power supply and supplying power from the DC auxiliary power supply to the DC / AC converter, the high voltage discharge lamp is prevented from extinguishing due to a momentary voltage drop of the DC main power supply during stable lighting. .

Further, a charging / discharging control circuit for receiving a lighting command and the output of the DC main power supply and applying a control signal to the input control means and the first output control means is provided, and the DC main power supply is activated from the DC main power supply immediately after the start of light. When the output power increases, power is supplied from the DC auxiliary power supply to the DC / AC converter to reduce the load of power supply from the DC main power supply.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a specific main configuration of a discharge lamp lighting device according to an embodiment of the present invention.

FIG. 3 is a block diagram showing another specific main configuration of the discharge lamp lighting device according to the embodiment of the present invention.

FIG. 4 is a diagram showing another example of the charge / discharge control circuit in the discharge lamp lighting device according to the embodiment of the present invention.

FIG. 5 is a waveform chart showing changes in start timing and current consumption in the discharge lamp lighting device of FIG.

FIG. 6 is a waveform diagram showing the timing when the instantaneous voltage changes in the discharge lamp lighting device of FIG.

FIG. 7 is a waveform diagram showing changes in timing and current consumption at the time of rising of light in the discharge lamp lighting device of FIG.

FIG. 8 is a block diagram of a conventional discharge lamp lighting device.

FIG. 9 is a waveform diagram showing a change in current consumption at the time of starting in the discharge lamp lighting device of the conventional example.

[Explanation of symbols] 1 DC main power supply 2 DC / DC converter 3 DC / AC converter 4 pulse application circuit 5 High pressure discharge lamp 6 DC auxiliary power supply 7 Start pulse generation circuit 8 Charge / discharge control circuit 9 Input control means 10 First output control means 11 Second output control means 12 Lighting detection circuit

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Claims (6)

(57) [Claims] 1. A DC main power supply, a DC auxiliary power supply, a switch connected to the DC main power supply and operated by a lighting command, an input control means connected between the switch and the DC auxiliary power supply, and a DC auxiliary power supply. Output control means connected to the output of the switch and the output of the switch, a DC / AC converter for AC converting the output of the first output control means, and a second output control means connected to the output of the DC auxiliary power supply. A starting pulse generating circuit connected to the second output control means, and the D
A pulse applying circuit connected to the C / AC converter and the starting pulse generating circuit, a high pressure discharge lamp connected to the pulse applying circuit, a lighting detection circuit for detecting a lighting state of the high pressure discharge lamp, a lighting command and the lighting detection. A charging / discharging control circuit for receiving a circuit output and applying a control signal to the input control means, the first output control means and the second output control means, and flowing a charging current through the input control means when a start pulse is not generated. ,
On the other hand, the first output control means and the second output control means are cut off to suppress the discharge current, and when the start pulse is generated, the input control means suppresses the charging current to operate the first output control means and the second output control means 2. Discharge lamp lighting device configured to allow discharge current to flow. 2. A charging / discharging control circuit is provided with a means for delaying the operations of the input control means, the first output control means and the second output control means when a lighting signal from the lighting detection circuit is inputted, The discharge lamp lighting device according to claim 1, wherein residual charge is applied to the DC / AC converter to make it easier to maintain lighting of the high pressure discharge lamp. 3. A DC main power supply, a DC auxiliary power supply, a switch connected to the DC main power supply and operated by a lighting command, an input control means connected between the switch and the DC auxiliary power supply, and a DC auxiliary power supply. Output control means connected to the output of the switch and the output of the switch, a DC / AC converter for converting the output of the first output control means into an alternating current, and a starting pulse generation circuit connected to the output of the DC auxiliary power supply. A pulse applying circuit connected to the DC / AC converter and the starting pulse generating circuit, a high pressure discharge lamp connected to the pulse applying circuit, a lighting detection circuit for detecting a lighting state of the high pressure discharge lamp, and the DC main power supply And a charging / discharging control circuit that receives the output of the lighting detection circuit and applies a control signal to the first input control means. When the high-pressure discharge lamp is lit, the DC main power output is provided. When the input voltage momentarily drops, the charging current from the input control means is suppressed, the first output control means is operated to discharge the electric charge from the DC auxiliary power supply, and the lighting of the high pressure discharge lamp is maintained. Discharge lamp lighting device. 4. A charge / discharge control circuit is provided with means for delaying the operations of the input control means and the first output control means when the output voltage from the DC main power supply is restored, and the residual charge of the DC auxiliary power supply is set to DC / The discharge lamp lighting device according to claim 3, wherein the high voltage discharge lamp is applied to an AC converter to make it easy to maintain lighting. 5. A DC main power supply, a DC auxiliary power supply, a switch connected to the DC main power supply and operated by a lighting command, an input control means connected between the switch and the DC auxiliary power supply, and a DC auxiliary power supply. Output control means connected to the output of the switch and the output of the switch, a DC / AC converter for AC converting the output of the first output control means, and a starting pulse generation circuit connected to the output of the DC auxiliary power supply, The D
A pulse applying circuit connected to the C / AC converter and the starting pulse generating circuit, a high-pressure discharge lamp connected to the pulse applying circuit, a lighting detection circuit for detecting a lighting state of the high-pressure discharge lamp, a lighting command and the DC main A charging / discharging control circuit for receiving an output of a power supply and applying a control signal to the input control means and the first output control means, and charging from the input control means when the DC main power output power increases at the time of starting. A discharge lamp lighting device in which a current is suppressed and the first output control means is operated to discharge electric charges from the DC auxiliary power supply. 6. The input control means is operated for a fixed time at the time of starting, the first output control means is shut off to accumulate electric charges in the DC auxiliary power source, and then the charging current from the input control means is suppressed, The discharge lamp lighting device according to claim 5, wherein the output control means is operated to discharge the electric charge from the DC auxiliary power supply.