JP2010146880A - Discharge lamp lighting device and luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device having a smaller number of components while keeping steady-state output power at a rated value even when a variable resistance value has changed with aging deterioration after delivery. <P>SOLUTION: The discharge lamp lighting device includes a control circuit 23 for controlling the supply of constant power to a high pressure discharge lamp 21 in accordance with detected voltage on a voltage detecting circuit 26 and a detected current in a current detecting circuit 30, a switching circuit 32 for generating a predetermined electric signal, and a DC voltage circuit 31 for varying a voltage value to keep the power of the high pressure discharge lamp 21 rated. The control circuit 23 stores the voltage value to be varied with the DC voltage circuit 31 in a storage device when the predetermined electric signal is input from the switching circuit 32, and sets the voltage value stored in the storage device right before interrupting the signal, as a reference value for the constant power control of the high pressure discharge lamp 21 when the input of the predetermined electric signal is interrupted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a discharge lamp lighting device having a function of adjusting the output power of a high-pressure discharge lamp in a steady state so as to be rated, and a lighting fixture including the discharge lamp lighting device.

  The conventional discharge lamp lighting device includes a control unit that controls the power supplied to the discharge lamp based on the current value and the voltage value of the discharge lamp detected by the voltage dividing resistor. By changing the value and changing the DC voltage input to the control unit, the output power in the steady state is adjusted to be rated (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 7-135086 (page 3-4, FIG. 2)

  The above-described conventional discharge lamp lighting device is adjusted so that the output power in the steady state is rated by changing the value of the variable resistance and changing the DC voltage input to the control unit before shipment. However, even after shipment, the power supplied to the discharge lamp also fluctuates based on the voltage value of the DC voltage input to the control unit. The power may not be rated.

  The present invention has been made to solve the above-described problems. Even when the value of the variable resistance fluctuates due to aging or the like after shipment, the output power in a steady state is rated and the components It is an object of the present invention to provide a discharge lamp lighting device capable of reducing the number of points and a lighting fixture using the discharge lamp lighting device.

  A discharge lamp lighting device according to the present invention converts output power from a DC power supply circuit into AC and supplies it to an inverter circuit, voltage detection means for detecting a voltage supplied to the load circuit, and a load circuit. Current detecting means for detecting the flowing current, control means for controlling the inverter circuit so that the power of the load circuit becomes constant based on the detected voltage of the voltage detecting means and the detected current of the current detecting means, and the voltage by external operation The control means includes a signal generating means for generating a predetermined electric signal when applied, a voltage variable means for changing a voltage value based on an external operation, and a storage means, and the control means has a predetermined electric power from the signal generating means. When a signal is input, the voltage value changed by the voltage variable means is stored in the storage means, and when the input of a predetermined electric signal is cut off, it is stored in the storage means immediately before the electric signal is cut off. And the voltage value as the reference value for the constant power control of the load circuit.

  In the present invention, when a predetermined electric signal from the signal generating means is input, the voltage value variable by the voltage variable means is stored in the storage means, and when the input of the predetermined electric signal is cut off, Since the voltage value stored in the storage means immediately before interruption of the electrical signal is used as the reference value for constant power control of the load circuit, even if the value of the variable resistor for setting the reference value fluctuates due to aging degradation after shipment, Since there is no influence on the power control of the load circuit, the power supplied to the load circuit is stabilized and constant power control can be performed.

Embodiment 1 FIG.
FIG. 1 is a circuit diagram of a discharge lamp lighting device according to Embodiment 1 of the present invention.
In FIG. 1, a DC power supply circuit 1 of a discharge lamp lighting device includes, for example, a rectifier circuit 3 that rectifies AC power from an AC power supply 2 into DC power, and a capacitor 4 that is connected between output terminals of the rectifier circuit 3. The step-up chopper circuit 5 is connected between the output terminals of the rectifier circuit 3, and the step-down chopper circuit 10 is connected between the output terminals of the step-up chopper circuit 5.

  The step-up chopper circuit 5 described above has an inductor 6 connected to the anode side of the capacitor 4, a switching element 7 connected in parallel to the capacitor 4 via the inductor 6, and a connection point between the inductor 6 and the switching element 7. It comprises a diode 8 connected in the direction and an electrolytic capacitor 9 connected in parallel to the switching element 7 via the diode 8.

  The step-down chopper circuit 10 includes a switching element 11 connected to a connection point between the diode 8 of the step-up chopper circuit 5 and the electrolytic capacitor 9, and a forward diode connected in parallel to the electrolytic capacitor 9 via the switching element 11. 13, an inductor 12 connected to a connection point between the switching element 11 and the diode 13, and a capacitor 14 connected in parallel to the diode 13 via the inductor 12.

  Between the output terminals of the step-down chopper circuit 10, a series circuit of the first switching element 15 and the second switching element 16 and a series circuit of the third switching element 17 and the fourth switching element 18 are parallel. It has a connected full-bridge inverter circuit.

  Further, between the connection point between the first switching element 15 and the second switching element 16 and between the connection point between the third switching element 17 and the fourth switching element 18, the secondary winding side of the step-up transformer 20 is provided. And a high-pressure discharge lamp 21 such as an HID lamp are connected in series, and a capacitor 19 is connected in parallel to the load circuit. A starting circuit 22 is provided on the primary winding side of the step-up transformer 20.

  A voltage detection circuit 29 composed of a resistance voltage dividing circuit is connected between the output terminals of the step-down chopper circuit 10, and a current detection circuit 30 composed of a resistor is connected between the step-down chopper circuit 10 and the inverter circuit. Yes. The voltage detection circuit 29 detects the output voltage of the step-down chopper circuit 10 (corresponding to the voltage of the high-pressure discharge lamp 21), and the current detection circuit 30 outputs the output current of the step-down chopper circuit 10 (corresponds to the current of the high-pressure discharge lamp 21). Is detected.

  The control circuit 23 includes a resistor 24 and a variable resistor 25, and includes a DC voltage circuit 31 (voltage variable means) that varies the voltage according to the resistance value of the variable resistor 25, two resistors 26 and 27, and a switch 28. A switch circuit 32 (signal generating means) that outputs a predetermined electrical signal when the switch 28 is turned on is connected. As will be described later, the control circuit 23 includes a storage device that holds a voltage generated by the DC voltage circuit 31 when an electric signal from the switch circuit 32 is input. The control circuit 23 steps down the voltage according to the control of the switching elements 15, 16, 17, and 18 of the full-bridge inverter circuit and the values detected by the voltage detection circuit 29 and the current detection circuit 30 of the high-pressure discharge lamp 21. The switching element 11 of the chopper circuit 10 is on / off controlled at a high frequency to control the power of the high pressure discharge lamp 21.

Next, the operation in the case of adjusting the power so that the output power at the steady state of the high-pressure discharge lamp is rated will be described. This power adjustment is performed before the discharge lamp lighting device is shipped.
When the control circuit 23 performs power control of the high-pressure discharge lamp 21 based on the detection voltage of the voltage detection circuit 29 and the detection current of the current detection circuit 30, the control circuit 23 responds to the voltage value stored in the storage device of the control circuit 23. The detection voltage of the voltage detection circuit 29 and the detection current of the current detection circuit 30 are corrected using the set coefficient. This is because the resistance values of the voltage detection circuit 29 and the current detection circuit 30 vary.

  When the output power of the high pressure discharge lamp 20 is in a steady state by the power control of the control circuit 23, when the switch 28 of the switch circuit 32 is turned on, a predetermined electrical signal is output from the switch circuit 32 to the control circuit 23. . At this time, the control circuit 23 reads the voltage value (DC voltage) of the DC voltage circuit 31 and stores it in the storage device. The voltage value is read from time to time, and the voltage value is updated each time.

  Next, the variable resistor 25 of the DC voltage circuit 31 is adjusted so that the output power of the high-pressure discharge lamp 21 measured by a power measuring device (not shown) connected in advance to the output side of the discharge lamp lighting device is rated. To do. When the switch 28 of the switch circuit 32 is turned off when the output power of the high-pressure discharge lamp 21 measured by the power meter reaches a rating due to the adjustment of the variable resistor 25, the control circuit 23 causes the DC voltage circuit 31 to Reading of the voltage value is stopped, and the voltage value stored in the storage device immediately before the switch 28 is turned off is held as a reference value for constant power control of the high-pressure discharge lamp 21.

  As described above, according to the first embodiment, when adjusting the output power of the high-pressure discharge lamp 21 before the discharge lamp lighting device is shipped, the voltage value adjusted by the variable resistor 25 is stored in the storage device of the control circuit 23 as needed. When the power adjustment is completed, the voltage value stored in the storage device immediately before the completion of the power adjustment is held as a reference value for constant power control of the high-pressure discharge lamp 21. Even if the value fluctuates, the power control of the high-pressure discharge lamp 21 is not affected, so that the power supplied to the high-pressure discharge lamp 21 is stabilized and constant power control can be performed. In addition, since the power supply to the high pressure discharge lamp 21 is stabilized, the life of the discharge lamp lighting device can be extended.

  In addition, when adjusting the output power of the high-pressure discharge lamp 21 before shipment, the DC voltage connected to the control circuit 23 is controlled by performing power control using the voltage value stored in the storage device of the control circuit 23. It can also be confirmed that the voltage value of the circuit 31 is securely stored in the storage device.

Embodiment 2. FIG.
In the first embodiment described above, the switch circuit 32 that outputs a predetermined electric signal to the control circuit 23 is provided in order to adjust the output power of the high-pressure discharge lamp 21, but the second embodiment includes the switch circuit 32. The output power of the high-pressure discharge lamp 21 can be adjusted without using it.

FIG. 2 is a circuit diagram around the control circuit in the discharge lamp lighting device according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the part similar to Embodiment 1 demonstrated in FIG.
As shown in FIG. 2, the discharge lamp lighting device of the present embodiment includes a control circuit 23 to which a DC voltage circuit 31 composed of a resistor 24 and a variable resistor 25 is connected.

  In the present embodiment, when power is applied to the discharge lamp lighting device, the control circuit 23 determines whether the voltage value of the DC voltage circuit 31 is, for example, 0 V (predetermined value). In order to set the voltage value of the DC voltage circuit 31 to 0V, the value of the variable resistor 25 is set to 0Ω. This setting is performed before the discharge lamp lighting device is turned on. When the control circuit 23 detects a voltage value of 0 V, it reads the voltage value and stores it in the storage device. The voltage value is read from time to time, and the voltage value is updated each time.

  When the output power of the high-pressure discharge lamp 20 reaches a steady state by the power control of the control circuit 23, the high-pressure discharge lamp 21 measured by a power meter (not shown) connected in advance to the output side of the discharge lamp lighting device. When the variable resistor 25 of the DC voltage circuit 31 is adjusted so that the output power of the output voltage is rated, the control circuit 23 reads the voltage value (DC voltage) based on the adjustment of the variable resistor 25 and stores the voltage value stored in the storage device. Update. The control circuit 23 determines that the power adjustment is completed when, for example, 5 seconds elapses after the power source is applied to the discharge lamp lighting device, stops reading the voltage value from the DC voltage circuit 31, and stores it in the storage device immediately before the stop. The stored voltage value is held as a reference value for constant power control of the high pressure discharge lamp 21.

  As described above, according to the second embodiment, when the voltage value of the DC voltage circuit 31 is 0 V when the power is supplied to the discharge lamp lighting device, the voltage value of the DC voltage circuit 31 is stored in the storage device as needed. Then, storage of the voltage value of the DC voltage circuit 31 in the storage device is stopped when 5 seconds have elapsed since the power supply is applied to the discharge lamp lighting device, and the last stored voltage value is used as the constant power of the high-pressure discharge lamp 21. Since it is held as the control reference value, the switch circuit 32 for adjusting the output power of the high-pressure discharge lamp 21 becomes unnecessary, and the discharge lamp lighting device can be downsized. In addition, since the power supply to the high pressure discharge lamp 21 is stabilized, the life of the discharge lamp lighting device can be extended.

Embodiment 3 FIG.
In the first and second embodiments described above, it has been described that the circuit necessary for adjusting the output power of the high-pressure discharge lamp 21 is provided in the discharge lamp lighting device, but in the third embodiment, the circuit is separately prepared, It is designed to be connected to a discharge lamp lighting device during use.

FIG. 3 is a circuit diagram around the control circuit in the discharge lamp lighting device according to Embodiment 3 of the present invention. In addition, the same code | symbol is attached | subjected to the part similar to Embodiment 1 demonstrated in FIG.
The discharge lamp lighting device of the present embodiment includes a power adjustment substrate 33 that is connected to a circuit board of the device when adjusting the output power of the high-pressure discharge lamp 21. The power adjustment substrate 33 is applied to the same type of discharge lamp lighting device. Other circuits are the same as those in FIG.

  As shown in FIG. 3, the power adjustment board 33 includes four connector terminals 33a, 33b, 33c and 33d, a resistor 24 and a variable resistor 25 connected in series between the connector terminals 33a and 33b, and a connector terminal. The resistor 26 and the switch 28 are connected in series between 33a and 33d. When the power adjustment substrate 33 is connected to the circuit board of the discharge lamp lighting device, the resistor 24 and the variable resistor 25 operate as a DC voltage circuit, and the resistor 26 and the switch 28 are connected to the resistor 27 connected to the control circuit 32. The switch circuit is configured with this.

  Next, the operation in the case of adjusting the power so that the output power at the steady state of the high-pressure discharge lamp is rated will be described. Note that correction of the detection voltage and detection current due to variations in resistance values of the voltage detection circuit 29 and the current detection circuit 30 is the same as that described in the first embodiment, and therefore only the operation in the case of power adjustment will be described. To do.

  After the output power of the high-pressure discharge lamp 20 reaches a steady state by the power control of the control circuit 23, the power adjustment board 33 is connected to the circuit board of the discharge lamp lighting device, and the switch 28 on the power adjustment board 33 is connected. When the switch is turned on, a predetermined electrical signal is output to the control circuit 23 from the switch circuit 32 including the two resistors 26 and 27 and the switch 28. At this time, the control circuit 23 reads the voltage value (DC voltage) from the DC voltage circuit composed of the resistor 24 and the variable resistor 25 and stores it in the storage device. The voltage value is read from time to time, and the voltage value is updated each time.

  Next, the variable resistor 25 on the power adjustment board 33 is rated so that the output power of the high-pressure discharge lamp 21 measured by a power measuring instrument (not shown) connected in advance to the output side of the discharge lamp lighting device is rated. Adjust. When the switch 28 is turned off when the output power of the high-pressure discharge lamp 21 measured by the power meter becomes rated by adjusting the variable resistor 25, the control circuit 23 reads the voltage value from the DC voltage circuit. The voltage value stored in the storage device immediately before the switch 28 is turned off is held as a reference value for constant power control of the high-pressure discharge lamp 21.

  When the power adjustment is completed, the power adjustment board 33 is removed from the discharge lamp lighting device. Furthermore, when adjusting the output power of the high-pressure discharge lamp 21 in a steady state with respect to another discharge lamp lighting device before shipment, the power adjustment is performed by attaching the power adjustment board 33 removed earlier. To do.

  As described above, according to the third embodiment, when adjusting the output power before shipment of the discharge lamp lighting device, the power adjustment board 33 is attached to the discharge lamp lighting device, and the output power is adjusted by the power adjustment board 33. Is completed, the power adjustment board 33 is removed and applied to another discharge lamp lighting device, so that the number of parts of the discharge lamp lighting device can be reduced and the discharge lamp lighting device can be downsized. it can.

  In the third embodiment, the power adjustment substrate 33 on which the resistor 24 and the variable resistor 25, the resistor 26, and the switch 28 are mounted has been described. However, the second embodiment is also connected to the control circuit 23. By using the DC voltage circuit 31 as a separate substrate for power adjustment, the same effect as in the third embodiment can be obtained.

  In the first to third embodiments, the output power is adjusted by connecting the high pressure discharge lamp 21 to the discharge lamp lighting device before shipment. However, a resistance load equivalent to the rated impedance of the high pressure discharge lamp 21 is applied. The output power may be adjusted by connecting to a discharge lamp lighting device. In this case, it is possible to adjust the power so that the output power becomes rated without performing the control for starting and lighting the high-pressure discharge lamp 21, and the time required for the power adjustment can be shortened.

Embodiment 4 FIG.
By incorporating the discharge lamp lighting device described in the first to third embodiments into a lighting fixture, stable lighting control of the lighting fixture becomes possible, and a downsized lighting fixture is obtained.

1 is a circuit diagram of a discharge lamp lighting device according to Embodiment 1 of the present invention. It is a circuit diagram around the control circuit in the discharge lamp lighting device of Embodiment 2 of the present invention. It is a circuit diagram around the control circuit in the discharge lamp lighting device of Embodiment 3 of the present invention.

Explanation of symbols

1 DC power supply circuit, 2 AC power supply, 3 rectifier circuit, 4 capacitor, 5 step-up chopper circuit, 6 inductor, 7 switching element, 8 diode, 9 electrolytic capacitor, 10 step-down chopper circuit, 11 switching element, 12 inductor, 13 diode, 14 capacitors, 15 first switching elements, 16 second switching elements, 17 third switching elements, 18 fourth switching elements, 19 capacitors, 20 step-up transformers, 21 high-pressure discharge lamps, 22 starting circuits, 23 control circuits , 24 resistance, 25 variable resistance, 26 resistance, 27 resistance, 28 switch, 29 voltage detection circuit,
30 current detection circuit, 31 DC voltage circuit, 32 switch circuit, 33 power adjustment board, 33a-33d connector terminal.

Claims (7)

An inverter circuit that converts the output power from the DC power supply circuit to AC and supplies it to the load circuit;
Voltage detecting means for detecting a voltage supplied to the load circuit;
Current detecting means for detecting a current flowing in the load circuit;
Control means for controlling the inverter circuit so that the power of the load circuit becomes constant based on the detection voltage of the voltage detection means and the detection current of the current detection means;
Signal generating means for generating a predetermined electrical signal when a voltage is applied by an external operation;
Voltage varying means for varying the voltage value based on an external operation;
Storage means,
When the predetermined electric signal from the signal generating means is input, the control means stores the voltage value variable by the voltage variable means in the storage means, and the input of the predetermined electric signal is cut off. In this case, the discharge lamp lighting device is characterized in that the voltage value stored in the storage means immediately before the interruption of the electric signal is used as a reference value for constant power control of the load circuit.   2. The control unit according to claim 1, wherein the control unit stores the voltage value that is varied by the voltage varying unit as needed in the storage device while a predetermined electrical signal is input from the signal generating unit. Discharge lamp lighting device.   3. The discharge lamp lighting device according to claim 1, wherein the signal generation unit and the voltage variable unit are mounted on different substrates for power adjustment of the load circuit. 4. An inverter circuit that converts the output power from the DC power supply circuit to AC and supplies it to the load circuit;
Voltage detecting means for detecting a voltage supplied to the load circuit;
Current detecting means for detecting a current flowing in the load circuit;
Control means for controlling the inverter circuit so that the power of the load circuit becomes constant power based on the detection voltage of the voltage detection means and the detection current of the current detection means;
Voltage varying means for varying the voltage value based on an external operation;
Storage means,
When the voltage value of the voltage variable means is a predetermined value, the control means stores the voltage value from the voltage variable means inputted thereafter in the storage means, and the voltage value stored in the storage means A discharge lamp lighting device having a reference value for constant power control of the load circuit.   When the voltage value of the voltage variable means is a predetermined value when the power is applied, the control means stores the voltage value from the voltage variable means that is input thereafter in the storage means as needed, and the power supply 5. The discharge lamp according to claim 4, wherein when a predetermined time elapses from the application of the voltage, the voltage value stored in the storage means immediately before the elapse of the predetermined time is used as a reference value for constant power control of the load circuit. Lighting device.   The discharge lamp lighting device according to claim 4 or 5, wherein the voltage generation means is mounted on another substrate for power adjustment of the load circuit.   A lighting fixture comprising the discharge lamp lighting device according to any one of claims 1 to 6.

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