JP4910549B2 - Power supply device for control, discharge lamp lighting device and lighting device - Google Patents

Description

  The present invention relates to a control power supply device that outputs a plurality of DC control voltages, a discharge lamp lighting device that uses the control power supply device, and a lighting device that includes the discharge lamp lighting device.

  2. Description of the Related Art Conventionally, as a control power supply apparatus that outputs a plurality of DC control voltages, a system that uses a series regulator to generate a high voltage and then generates a low voltage using this series regulator is known. In particular, recently, the drive unit is controlled by an analog IC whose power source is a high DC control voltage, for example, about 15V, and this analog IC is controlled by a microcomputer whose power source is a low DC control voltage, for example, about 3.3V. In such cases, the amount of voltage stepped down by the series regulator tends to increase.

  Also, in a discharge lamp lighting device, a DC power supply is provided with a boost chopper circuit to improve the power factor, an auxiliary winding is added to the inductor of this boost chopper circuit, and the voltage induced in this auxiliary winding is rectified. If the igniter circuit is intermittently driven during start-up to generate a high-voltage pulse intermittently when the control circuit power supply is smoothed, the power supply voltage is secured from the auxiliary winding during light load periods when the igniter circuit does not operate There is a problem that it becomes impossible to do.

For this reason, a power supply voltage is known by connecting a series circuit of a resistor and a transistor in parallel between the output terminals of the boost chopper circuit and turning on the transistor during a period when the igniter circuit does not operate. (For example, refer to Patent Document 1).
JP 2003-203790 A

  A conventional control power supply device that outputs a plurality of DC control voltages has a problem that a large amount of voltage is stepped down from a higher DC control voltage to a lower DC control voltage, and power loss due to the step-down is large.

  In addition, in a conventional discharge lamp lighting device, current is passed through a resistor during a light load period in which the igniter circuit does not operate, so wasteful power consumption occurs, and a resistor having a large capacity must be used as a resistor. There was a problem that should not be.

  Therefore, the present invention provides a control power supply apparatus that can reduce power loss.

  The present invention also provides a discharge lamp lighting device and a lighting device that can reduce power loss.

  In addition, the present invention provides a discharge lamp lighting device and a lighting device that can reduce power loss and suppress generation of wasteful power consumption.

The invention corresponding to claim 1 is a first control means that operates by supplying a predetermined voltage , a DC power source that supplies a DC power supply voltage, and a first DC voltage that is lower than the DC power supply voltage. Voltage step-down means for stepping down to a second DC voltage lower than the first DC voltage, and the voltage step-down means controls the step-down of the DC power supply voltage to the first and second DC voltages, and Second control means that operates at a voltage lower than that of the first control means; the first and second DC voltages output from the voltage step-down means are converted into a voltage lower than the second DC voltage, and the first Voltage supply means for supplying power to the second control means, smoothing means for smoothing the first and second DC voltages output from the voltage step-down means, and for supplying power as the power for the first control means A power supply for control.

  The voltage step-down means uses, for example, an IPD (intelligent power device) to switch the DC voltage from the DC power supply to, for example, a DC voltage of about 15 V and a DC voltage of about 5 V, which is lower than the DC voltage. . The first control voltage supply means outputs the DC voltage from the voltage step-down means to the first control means as a power source. The direct-current voltage at this time is, for example, a voltage that changes between 15V and 12V. The second control voltage supply means uses, for example, a three-terminal regulator to step down the voltage changing between 15V and 5V to a DC voltage lower than that, for example, about 3.3V. Output to the control means as a power source.

According to a second aspect of the present invention, there is provided a direct current power supply for supplying a direct current power supply voltage, a lighting circuit connected to the direct current power supply for operating a discharge lamp, and a first direct current voltage lower than the direct current power supply voltage. voltage and a voltage step-down means for stepping down the lower second DC voltage from the first DC voltage, a first control means that controls the lighting circuit, the said voltage step-down means the DC power supply voltage a A second control that controls the first control means so that the discharge lamp power is constant, and operates at a power supply voltage lower than that of the first control means. Voltage supply means for converting the first and second DC voltages output from the voltage step-down means to a voltage lower than the second DC voltage and supplying the voltage as a power source for the second control means; The first output from the voltage step-down means. And a second DC voltage smoothing, in the discharge lamp lighting apparatus comprising: a smoothing means for supplying a power of said second control means.
The first control means is composed of, for example, an analog IC, and inputs the first control voltage as a power source to control the lighting circuit. The second control means is composed of, for example, a microcomputer, and inputs the second control voltage as a power source to control the first control means.

3. correspondence invention claimed, in the discharge lamp lighting apparatus according to claim 2, wherein said voltage step-down means, when starting the DC power supply or lighting circuit, or at the time of restart to output the first DC voltage. That is, when starting the DC power supply or lighting circuit, or by outputting a first voltage on reboot, so the first control means and second control means may start the operation immediately.

Claim 4 corresponds invention, in the discharge lamp lighting device according to claim 2 or 3, wherein said voltage step-down means, during operation dormant or stopping of the lighting circuit to output said second DC voltage. That is, by generating a lower second DC voltage while the lighting circuit is not operating or stopped, generation of more wasted power consumption can be suppressed.

The invention corresponding to claim 5 includes a lighting fixture body, the discharge lamp lighting device according to any one of claims 2 to 4 attached to the lighting fixture body, and a discharge lamp disposed in the lighting fixture body. It is in the illuminating device which comprises.

ADVANTAGE OF THE INVENTION According to this invention, the power supply device for control which can make power loss small can be provided.
Moreover, according to this invention, the discharge lamp lighting device and illuminating device which can make a power loss small can be provided.
Further, according to the present invention, it is possible to provide a discharge lamp lighting device and a lighting device that can reduce power loss and suppress generation of wasteful power consumption.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
In this embodiment, the present invention is applied to a control power supply device.

  As shown in FIG. 1, a non-insulated step-down regulator 6 including an IPD (intelligent power device) 2, an inductor 3, a diode 4 and a smoothing capacitor 5 is connected to a DC power source 1. That is, the step-down regulator 6 is connected to the DC power source 1 with the IPD 2 connected in series with a reverse polarity in series with the diode 4, and the smoothing capacitor 5 connected in parallel with the diode 4 through the inductor 3 in series. .

A light emitting diode 9D of a photocoupler 9 is connected in series to the smoothing capacitor 5, and a second constant voltage diode 12 is connected in parallel to a first constant voltage diode 10 via a MOS type FET (field effect transistor) 11. Connected parallel circuits are connected. The phototransistor 9T of the photocoupler 9 is connected to the control terminal of the IPD2.
The step-down regulator 6, the first constant voltage diode 10, the FET 11 and the second constant voltage diode 12 constitute voltage step-down means.

  The smoothing capacitor 5 is connected in parallel with an input terminal of a three-terminal regulator 7 as second control voltage supply means. The three-terminal regulator 7 is connected to an integrated circuit (IC-2) 8 having a microcomputer as second control means at the output end. The power supply voltage of the integrated circuit (IC-2) 8 is, for example, 3.3V, and the three-terminal regulator 7 steps down the direct current voltage from the voltage step-down means to 3.3V and the integrated circuit (IC−). 2) Supply to 8.

  The first constant voltage diode 10 is, for example, one having a Zener voltage of 15V, and the second constant voltage diode 12 is, for example, having a Zener voltage of 5V. The FET 11 is alternately turned on and off by the microcomputer of the integrated circuit (IC-2) 8.

  When the FET 11 is off, the first constant voltage diode 10 is turned on and the photocoupler 9 is operated when a voltage of 15 V or more is generated in the smoothing capacitor 5. Then, by the operation of the photocoupler 9, the IPD 2 operates so that the output voltage is maintained at 15V. When the FET 11 is on, when the voltage of 5 V or more is generated in the smoothing capacitor 5, the second constant voltage diode 12 is turned on and the photocoupler 9 is operated. Then, by the operation of the photocoupler 9, the IPD 2 operates so that the output voltage is maintained at 5V.

  A smoothing capacitor 14 is connected in parallel to the first smoothing capacitor 5 via a rectifying diode 13 in series with a forward polarity. The rectifying diode 13 and the smoothing capacitor 14 constitute first control voltage supply means, and the DC voltage from the voltage step-down means is smoothed by the smoothing capacitor 14 and output. An integrated circuit (IC-1) 15 made of an analog IC is connected to the smoothing capacitor 14 as a first control means. The integrated circuit (IC-1) 15 operates normally if the power supply voltage is 12V or higher.

  In such a configuration, the step-down regulator 6 including the IPD 2 steps down the DC voltage from the DC power source 1 to 15V. When the power is turned on, a voltage of 15 V is generated in the smoothing capacitor 5, and the smoothing capacitor 14 is charged via the diode 13. Then, a DC voltage of approximately 15 V is supplied from the smoothing capacitor 14 to the integrated circuit (IC-1) 15 as the first control voltage.

  The DC voltage generated in the smoothing capacitor 5 is also supplied to the three-terminal regulator 7. The three-terminal regulator 7 steps down the input DC voltage to 3.3 V and supplies it to the integrated circuit (IC-2) 8. The integrated circuit (IC-2) 8 starts operating upon receiving a DC voltage of 3.3V.

  The integrated circuit (IC-2) 8 turns on and off the FET 11 at a predetermined cycle. For example, if the minimum voltage required for the operation of the integrated circuit (IC-1) 15 is 12V, the integrated circuit (IC-2) 8 has a voltage generated in the smoothing capacitor 14 of 15V to 12V. The off-time and on-time of the FET 11 are controlled so as to change repeatedly.

  The voltage step-down means operates so that 15 V is generated in the smoothing capacitor 5 by the first constant voltage diode 10 when the FET 11 is turned off, and 5 V is applied to the smoothing capacitor 5 by the second constant voltage diode 12 when the FET 11 is turned on. Operates to occur. By such an operation, a voltage that changes to 15 V and 5 V is generated in the smoothing capacitor 5 as shown in FIG.

  The DC voltage generated in the smoothing capacitor 5 is supplied to the three-terminal regulator 7 and is also supplied to the smoothing capacitor 14 via the diode 13. The three-terminal regulator 7 steps down the input DC voltage to 3.3V. Thus, a constant voltage of 3.3 V as shown in FIG. 2B is supplied from the three-terminal regulator 7 to the integrated circuit (IC-2) 8.

  At this time, the three-terminal regulator 7 repeats the operation of reducing the voltage of 15V to 3.3V and the operation of reducing the voltage of 5V to 3.3V. That is, the three-terminal regulator 7 does not step down the constant voltage of 15V to 3.3V, but alternately steps down the 15V voltage and the 5V voltage to 3.3V. As a result, when the voltage is 5 V, the operation is only to reduce the voltage by 1.7 V, and the step-down voltage that is wasted becomes extremely small. Therefore, the average step-down voltage in the three-terminal regulator 7 including the operation of stepping down the 15V voltage to 3.3V becomes small. Thus, since the three-terminal regulator 7 can reduce the voltage to be stepped down, the power loss can be reduced.

  Further, as shown in FIG. 2 (c), the voltage generated in the smoothing capacitor 14 is about 15V when the FET 11 is off, but gradually decreases from about 15V when the FET 11 is on. When the voltage reaches approximately 12V, the operation of turning off the FET 11 and approximately 15V again is repeated. The voltage generated in the smoothing capacitor 14 is supplied to the integrated circuit (IC-1) 15. Thus, the integrated circuit (IC-1) 15 is always supplied with a voltage of 12V or more and operates normally.

(Second Embodiment)
This embodiment describes what applied this invention to the high pressure discharge lamp lighting device.
As shown in FIG. 3, the commercial AC power supply 21 is connected to the input terminal of a full-wave rectifier circuit 23 composed of a diode bridge via a noise prevention filter circuit 22.
A capacitor 24 is connected in parallel to the output terminal of the full-wave rectifier circuit 23, and a boost chopper circuit 25 is connected. The full-wave rectifier circuit 23 and the boost chopper circuit 25 constitute a DC power source.

  The step-up chopper circuit 25 is a series circuit of a MOS type first FET (field effect transistor) 27 and a current detection circuit 28 via a chopper inductor 26 connected in series to the output terminal of the full-wave rectifier circuit 23. Are connected in parallel, and a smoothing capacitor 30 is connected in parallel to the series circuit via a diode 29 in series with a forward polarity.

  The step-up chopper circuit 25 includes an integrated circuit (IC-3) 31 formed of an analog IC as a control unit, and inputs a current detection signal from the current detection circuit 28 to the integrated circuit (IC-3) 31 and the smoothing capacitor. The power supply voltage is input from 30. The integrated circuit (IC-3) 31 controls the timing for turning off the first FET 27 based on the current detection signal.

  A series circuit of a voltage detection circuit 32 and a current detection circuit 33 is connected in parallel to the smoothing capacitor 30, and a capacitor 34 and a full bridge type inverter circuit 35 constituting a lighting circuit are connected via the current detection circuit 33. Connected.

  The inverter circuit 35 includes second, third, fourth, and fifth FETs 36, 37, 38, and 39, an inductor 40, and a transformer 41, and a series circuit of the second and third FETs 36 and 37; A series circuit of fourth and fifth FETs 38 and 39 is connected in parallel. The connection point of the second and third FETs 36 and 37 is connected to one end of the high-pressure discharge lamp 42 through the inductor 40 and the secondary winding 41s of the transformer 41 in series, and the fourth and fifth The connection point of the FETs 38 and 39 is connected to the other end of the high-pressure discharge lamp 42. The primary winding 41p of the transformer 41 is connected to a starting circuit 43 comprising an igniter circuit. A capacitor 44 is connected to the high-pressure discharge lamp 42 in parallel.

  The inverter circuit 35 is provided with an integrated circuit (IC-1) 45 made of an analog IC as a first control means, and the FETs 36, 37, 38, 39 are switched by the integrated circuit (IC-1) 45. I am doing so. That is, the fourth and fifth FETs 38 and 39 are alternately turned on and off at a low frequency period, and the second FET 37 is turned on and off at a high frequency period while the fourth FET 38 is on. The first FET 36 is turned on and off at a high frequency period while the fifth FET 39 is on.

A control power supply device 50 is connected to the smoothing capacitor 30.
In the control power supply 50, a non-insulated step-down regulator 55 including an IPD (intelligent power device) 51, an inductor 52, a diode 53, and a smoothing capacitor 54 is connected to the smoothing capacitor 30. That is, the step-down regulator 55 has the smoothing capacitor 30 connected to the IPD 51 via a diode 53 in reverse polarity in series, and the diode 53 connected to the smoothing capacitor 54 in parallel via an inductor 52 in series. .

The control power supply device 50 includes a smoothing capacitor 54 and a light-emitting diode 58D of a photocoupler 58 connected in series, and a first constant-voltage diode 59 connected to a second constant voltage via a MOS-type sixth FET 60. A parallel circuit in which the voltage diode 61 is connected in parallel is connected. The phototransistor 58T of the photocoupler 58 is connected to the control terminal of the IPD 51.
The step-down regulator 55, the first constant voltage diode 59, the sixth FET 60, and the second constant voltage diode 61 constitute a voltage step-down means.

  The smoothing capacitor 54 is connected in parallel with an input terminal of a three-terminal regulator 56 as second control voltage supply means. The three-terminal regulator 56 is connected to an integrated circuit (IC-2) 57 having a microcomputer as second control means at the output end. The power supply voltage of the integrated circuit (IC-2) 57 is, for example, 3.3V, and the three-terminal regulator 56 steps down the direct current voltage from the voltage step-down means to 3.3V and the integrated circuit (IC−). 2) Supplying to 57.

  The first constant voltage diode 59 is, for example, one having a Zener voltage of 15V, and the second constant voltage diode 61 is, for example, having a Zener voltage of 5V. The sixth FET 60 is turned on and off at a predetermined cycle by the microcomputer of the integrated circuit (IC-2) 57.

  When the sixth FET 60 is off, the first constant voltage diode 59 is turned on and the photocoupler 58 is operated when a voltage of 15 V or more is generated in the smoothing capacitor 54. Then, by the operation of the photocoupler 58, the IPD 51 operates so that the output voltage is maintained at 15V. When the sixth FET 60 is on, when the voltage of 5 V or more is generated in the smoothing capacitor 54, the second constant voltage diode 61 is turned on and the photocoupler 58 is operated. Then, by the operation of the photocoupler 58, the IPD 51 operates so that the output voltage is maintained at 5V.

  Further, the control power supply device 50 has a smoothing capacitor 63 connected in parallel to a smoothing capacitor 54 via a rectifying diode 62 in series with a forward polarity. The rectifying diode 62 and the smoothing capacitor 63 constitute first control voltage supply means, and the DC voltage from the voltage step-down means is smoothed by the smoothing capacitor 63 and output. The smoothing capacitor 63 is connected to the power supply terminal of the integrated circuit (IC-1) 45 as the first control means and the integrated circuit (IC-3) 31 as the control unit of the boost chopper circuit 25. The integrated circuit (IC-1) 45 and the integrated circuit (IC-3) 31 operate normally when the power supply voltage is 12V or more.

  The step-up chopper circuit 25 has an auxiliary winding 64 attached to the inductor 26, one end of the auxiliary winding 64 is connected to the negative side of the output end of the full-wave rectifier circuit 23, and the other end is connected to the integrated circuit. (IC-3) 31 and a rectifying diode 65 is connected to the positive terminal of the smoothing capacitor 63 via a forward polarity. The auxiliary winding 64 induces a voltage by electromagnetic energy generated in the inductor 26 and applies the voltage to the smoothing capacitor 63 via the rectifying diode 65.

  The integrated circuit (IC-2) 57 as the second control means digitally converts the voltage detection signal from the voltage detection circuit 32 and the current detection signal from the current detection circuit 33 and takes them in from these signals. The lamp power is calculated and the integrated circuit (IC-1) 45 as the first control means is controlled so that the lamp power becomes constant. The integrated circuit (IC-1) 45 controls the on-duty of the first and second FETs 36 and 37 so that the lamp power becomes constant under the control of the integrated circuit (IC-2) 57.

  In addition, the integrated circuit (IC-2) 57 keeps the sixth FET 60 off for a certain period of time required for starting up each part when the power is turned on, so that the smoothing capacitor of the voltage step-down means A voltage of 15V is generated at 54, and thereby a voltage of approximately 15V is generated at the smoothing capacitor 63. Thereby, the integrated circuit (IC-1) 45 and the integrated circuit (IC-3) 31 are reliably started.

  Then, when a certain time has elapsed, the on / off control of the sixth FET 60 is started. At this time, the charging voltage of the smoothing capacitor 63 is monitored, and the on / off cycle and on-duty of the sixth FET 60 are controlled so that the charging voltage does not drop below 12V.

  In such a configuration, when the power is turned on, charging of the smoothing capacitor 30 is started, and power is supplied from the smoothing capacitor 30 to the control power supply device 50. In the control power supply device 50, the IPD 51 operates to generate a voltage of 15 V on the smoothing capacitor 54, and generate a voltage of approximately 15 V on the smoothing capacitor 63.

  As a result, the three-terminal regulator 56 operates to supply 3.3V power to the integrated circuit (IC-2) 57, and from the smoothing capacitor 63 to the integrated circuit (IC-1) 45 and the integrated circuit (IC-3). ) 31 is supplied with approximately 15V power. Thus, each integrated circuit 57, 31, 45 receives a supply of a sufficient power supply voltage at the time of start-up and starts operating smoothly. Then, the integrated circuit (IC-2) 57 controls the integrated circuit (IC-1) 45.

  When the integrated circuit (IC-3) 31 starts operating, the first FET 27 is switched by the integrated circuit (IC-3) 31 and the boost chopper circuit 25 starts operating. When the integrated circuit (IC-1) 45 starts operating, the inverter circuit 35 starts operating.

  In the inverter circuit 35, the fourth and fifth FETs 38 and 39 are alternately turned on and off at a low frequency with a slow cycle, and the third FET 37 is turned on at a high frequency with a fast cycle in the on period of the fourth FET 38. The second FET 36 is turned on and off at an early period of high frequency in the on period of the fifth FET 39. In addition, the starting circuit 43 operates and intermittently applies a high-pressure pulse to the high-pressure discharge lamp 42.

  When a certain time necessary for activation elapses, the integrated circuit (IC-2) 57 starts on / off control of the sixth FET 60. The voltage step-down means operates so that 15 V is generated in the smoothing capacitor 54 by the first constant voltage diode 59 when the sixth FET 60 is turned off, and by the second constant voltage diode 12 when the sixth FET 60 is turned on. The smoothing capacitor 54 operates to generate 5V.

  The DC voltage generated in the smoothing capacitor 54 is supplied to the three-terminal regulator 56 and also supplied to the smoothing capacitor 63 via the diode 62. The three-terminal regulator 56 steps down the input DC voltage to 3.3V. Thus, a constant voltage of 3.3 V is supplied from the three-terminal regulator 56 to the integrated circuit (IC-2) 57.

  At this time, the three-terminal regulator 56 repeats the operation of stepping down the 15V voltage to 3.3V and the step of stepping down the 5V voltage to 3.3V. That is, the three-terminal regulator 56 does not step down a constant voltage of 15V to 3.3V, but alternately steps down the 15V voltage and the 5V voltage to 3.3V. As a result, when the voltage is 5 V, the operation is only to reduce the voltage by 1.7 V, and the step-down voltage that is wasted becomes extremely small. Therefore, the average step-down voltage in the three-terminal regulator 56 including the operation of stepping down the 15V voltage to 3.3V becomes small. Thus, since the three-terminal regulator 56 can reduce the voltage to be stepped down, the power loss can be reduced.

  The voltage generated in the smoothing capacitor 63 is about 15V when the sixth FET 60 is off, but gradually decreases from about 15V to about 12V when the sixth FET 60 is on. When this happens, the operation of turning off the FET 60 and setting it to about 15 V again is repeated. The voltage generated in the smoothing capacitor 63 is supplied to the integrated circuit (IC-2) 31 and the integrated circuit (IC-3) 45. Thus, the integrated circuit (IC-1) 45 and the integrated circuit (IC-3) 31 are always supplied with a voltage of 12V or more and operate normally.

  Further, since there is a constant load during the period in which the start circuit 43 generates the high voltage pulse, the boost chopper circuit 25 generates a large electromagnetic energy in the inductor 26 by the switching operation of the first FET 27, thereby assisting. A voltage is induced in the winding 64. As a result, the smoothing capacitor 63 is charged via the rectifying diode 65. On the other hand, during the period in which the start circuit 43 stops generating the high voltage pulse, no large electromagnetic energy is generated in the inductor 26 even if the first FET 27 performs a switching operation. Accordingly, no voltage is induced in the auxiliary winding 64. At this time, the charging current to the smoothing capacitor 63 does not flow from the auxiliary winding 64 via the rectifying diode 65, but flows only from the voltage step-down means via the rectifying diode 62.

  As described above, at the time of starting, during the period in which the starting circuit 43 is generating the high voltage pulse, the charging current flows through the smoothing capacitor 63 from both the auxiliary winding 64 and the voltage step-down means. During the period when the generation of the current is stopped, the charging current flows through the smoothing capacitor 63 only from the voltage step-down means.

  Thus, the smoothing capacitor 63 always maintains a charging voltage exceeding 12 V at the time of starting, and the integrated circuit (IC-1) 45 and the integrated circuit (IC-3) 31 can maintain a stable operation. Then, the control power supply device 50 having the IPD 51 is used to secure the charging voltage of the smoothing capacitor 63 during the period in which the start circuit 43 stops generating the high voltage pulse and the operation of the inductor 26 is stopped. Therefore, it is not necessary to continue to flow current using a resistor as in the conventional case, and generation of useless power consumption can be suppressed.

When the high pressure discharge lamp 42 starts lighting, the operation of the starting circuit 43 stops, but a large lamp current flows through the high pressure discharge lamp 42. Therefore, in the boost chopper circuit 25, the switching operation of the first FET 27 is performed. As a result, large electromagnetic energy is generated in the inductor 26. As a result, a voltage is induced in the auxiliary winding 64, and a charging current flows through the smoothing capacitor 63 via the rectifying diode 65. Thus, after the high pressure discharge lamp 42 is turned on, the smoothing capacitor 63 is always maintained at a charging voltage of 15 V or more by the voltage induced in the auxiliary winding 64. Note that the three-terminal regulator 56 continues to operate during this time, and continues to step down the input DC voltage to 3.3 V and supply it to the integrated circuit (IC-2) 57.
In this embodiment, the present invention is applied to a high pressure discharge lamp lighting device. However, the present invention is not limited to this and can be applied to a normal discharge lamp lighting device.

(Third embodiment)
This embodiment describes another embodiment in which the present invention is applied to a high pressure discharge lamp lighting device. The same parts as those of the second embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, a pair regulator circuit 351 is connected instead of the inverter circuit 35. That is, instead of the smoothing capacitor 30 of FIG. 3, a series circuit of two smoothing capacitors 71 and 72 is connected, and the pair regulator circuit 351 constituting the lighting circuit is connected to the series circuit of the smoothing capacitors 71 and 72. Yes.

  The pair regulator circuit 351 connects the series circuit of the second and third FETs 36 and 37 in parallel to the series circuit of the smoothing capacitors 71 and 72, and the lamp current for detecting the lamp current at one end of the high-pressure discharge lamp 42. It connects to the connection point of the smoothing capacitors 71 and 72 via the detection circuit 73, and connects the other end of the high-pressure discharge lamp 42 to the second and second via the secondary winding 41s of the transformer 41 and the inductor 40 in series. 3 is connected to the connection point of the FETs 36 and 37. Diodes 74 and 75 are connected in parallel between the drains and sources of the second and third FETs 36 and 37, respectively, with reverse polarity.

  A lamp voltage detection circuit 76 for detecting a lamp voltage and a capacitor 77 are connected in parallel to the series circuit of the lamp current detection circuit 73, the high-pressure discharge lamp 42 and the secondary winding 41s of the transformer 41, respectively. The second and third FETs 36 and 37 are turned on and off at a high-frequency cycle by an integrated circuit (IC-1) 451 comprising an analog IC as a first control means.

The integrated circuit (IC-2) 57 as the second control means takes in the lamp voltage detection signal from the lamp voltage detection circuit 76 and digitally converts the lamp current detection signal from the lamp current detection circuit 73 and takes in the lamp power. Calculate. Then, the on-duty of the second and third FETs 36 and 37 is controlled so that the lamp power becomes constant. The integrated circuit (IC-1) 451 as the first control means drives the second and third FETs 36 and 37 on and off based on a control signal from the integrated circuit (IC-2) 57.
Other configurations are the same as those of the second embodiment described above.

  In such a configuration, the integrated circuit (IC-2) 57, which is the second control means, at the time of starting or restarting when the power is turned on, causes the sixth FET 60 to operate for a predetermined time required for starting each part. Is kept off. A voltage of 15 V is generated in the smoothing capacitor 54 of the step-down regulator 55 by the operation of the IPD 51. As a result, a voltage of approximately 15 V is generated in the smoothing capacitor 63 as shown in FIG. The voltage of the smoothing capacitor 63 becomes the power supply voltage of the integrated circuit (IC-1) 451 and the integrated circuit (IC-3) 31.

  In this way, the integrated circuit (IC-1) 451 and the integrated circuit (IC-3) 31 are reliably activated. The DC voltage generated in the smoothing capacitor 54 is also supplied to the three-terminal regulator 56. The three-terminal regulator 56 steps down the input DC voltage to 3.3 V and supplies it to the integrated circuit (IC-2) 57. The integrated circuit (IC-2) 57 starts operating upon receiving a DC voltage of 3.3V.

  When the integrated circuit (IC-1) 451 and the integrated circuit (IC-3) 31 are activated, the boost chopper circuit 25 starts its operation, and the pair regulator circuit 351 also starts its operation. In the step-up chopper circuit 25, the integrated circuit (IC-3) 31 drives the first FET 27 on and off by a high frequency control signal as shown in FIG.

When the step-up chopper circuit 25 starts operation, the first FET 27 is switched. When the pair regulator circuit 351 starts operation, the high-frequency on / off operation for a certain time by the second FET 36 and the high-frequency on / off operation for a certain time by the third FET 37 are alternately repeated.
In the pair regulator circuit 351, the starting circuit 43 operates, and a high-pressure pulse is intermittently applied to the high-pressure discharge lamp.

  Further, since there is a constant load during the period in which the start circuit 43 generates the high voltage pulse, the boost chopper circuit 25 generates a large electromagnetic energy in the inductor 26 by the switching operation of the first FET 27, thereby assisting. A voltage is induced in the winding 64. As a result, the smoothing capacitor 63 is charged via the rectifying diode 65. On the other hand, during the period in which the start circuit 43 stops generating the high voltage pulse, no large electromagnetic energy is generated in the inductor 26 even if the first FET 27 performs a switching operation. Accordingly, no voltage is induced in the auxiliary winding 64. At this time, the charging current to the smoothing capacitor 63 does not flow from the auxiliary winding 64 via the rectifying diode 65, but flows only from the voltage step-down means via the rectifying diode 62.

When the high pressure discharge lamp 42 is lit, the power supply voltage is maintained at 15 V from the auxiliary winding 64 to the smoothing capacitor 63 as shown in FIG.
On the other hand, the integrated circuit (IC-2) 57 turns on the sixth FET 60 when a predetermined time elapses. As a result, the charging voltage of the smoothing capacitor 54 of the step-down regulator 55 is reduced from 15V to 5V as shown in FIG.
During the pause of the intermittent operation of the starting circuit 43 when the high-pressure discharge lamp 42 cannot be lit, only the integrated circuit (IC-2) 57 as the second control means needs to continue the operation. The integrated circuit (IC-3) 31 of the chopper circuit 25 stops its operation while the intermittent operation of the starting circuit 43 is stopped, as shown in FIG. That is, the first FET 27 is not driven on / off.

  In the control power supply device 50, the sixth FET 60 is turned on by the integrated circuit (IC-2) 57 so that a voltage of about 5V is generated in the smoothing capacitor 54 as shown in FIG. Maintained. Accordingly, during the pause of the intermittent operation of the starting circuit 43, the voltage generated in the smoothing capacitor 63 is maintained at approximately 5V as shown in FIG. Thus, the step-down voltage by the three-terminal regulator 56 is reduced, so that the power loss can be reduced.

  When the starter circuit 43 finishes the rest period and operates again, the integrated circuit (IC-2) 57 turns off the sixth FET 60 and applies a voltage of approximately 15 V to the smoothing capacitor 63, similar to the start and restart. The integrated circuit (IC-1) 451 and the integrated circuit (IC-3) 31 are activated. Then, the starting circuit 43 is operated for a certain time.

  With this operation, when the temperature of the high-pressure discharge lamp 42 is sufficiently low, the high-pressure discharge lamp 42 is lit smoothly when the high-pressure pulse is generated by the start circuit 43 at the time of starting or restarting. It becomes like this. Further, when the high-pressure discharge lamp 42 is in a high temperature state, the high-pressure discharge lamp 42 is not lit even when the start-up circuit 43 generates a high-pressure pulse at the time of starting or restarting. The generation | occurrence | production operation | movement comes to be repeated intermittently. When the temperature of the high-pressure discharge lamp 42 decreases, the high-pressure discharge lamp 42 is turned on in response to a high-pressure pulse from the starting circuit 43.

  As described above, at the time of start-up or restart, the integrated circuit (IC-2) 57 maintains the sixth FET 60 in the OFF state, generates a voltage of 15 V in the smoothing capacitor 54 of the step-down regulator 55, and A voltage of approximately 15V is generated. Thereby, the integrated circuit (IC-1) 451 and the integrated circuit (IC-3) 31 can be reliably started. That is, the operations of the boost chopper circuit 25 and the pair regulator circuit 351 can be started immediately.

  When the high pressure discharge lamp 42 cannot be turned on immediately in a high temperature state, the start circuit 43 is intermittently operated to wait for the high pressure discharge lamp 42 to cool down. Can be turned on. Since the starting circuit 43 is operated intermittently, the influence of the high pressure on the high pressure discharge lamp can be reduced as compared with the case where the high pressure pulse is continuously generated. In addition, since the operations of the integrated circuit (IC-1) 451 and the integrated circuit (IC-3) 31 are stopped during the pause period in the intermittent operation of the starting circuit 43, it is possible to suppress unnecessary power consumption.

  Also in this apparatus, the DC voltage generated in the smoothing capacitor 54 is supplied to the three-terminal regulator 56 and also supplied to the smoothing capacitor 63 via the diode 62, and the three-terminal regulator 56 receives the input DC voltage. Is stepped down to 3.3V. The three-terminal regulator 56 repeats the operation of stepping down the 15V voltage to 3.3V and the step of stepping down the 5V voltage to 3.3V. As a result, when the voltage is 5 V, the operation is only to reduce the voltage by 1.7 V, and the step-down voltage that is wasted becomes extremely small. Accordingly, the step-down voltage in the three-terminal regulator 56 can be reduced and the power loss can be reduced as in the embodiment described above.

(Fourth embodiment)
This embodiment describes another embodiment in which the present invention is applied to a high pressure discharge lamp lighting device. In addition, the same code | symbol is attached | subjected to the part same as each embodiment mentioned above, and detailed description is abbreviate | omitted.

  As shown in FIG. 7, a half-bridge inverter circuit 352 is connected instead of the full-bridge inverter circuit 35 of FIG. This half-bridge type inverter circuit 352 has a series circuit of second and third FETs 36 and 37 connected in parallel to the smoothing capacitor 30, and one end of the high-pressure discharge lamp 42 is connected to the smoothing capacitor 30 via the lamp current detection circuit 73. Connected to the source terminal of the third FET 37, the other end of the high-pressure discharge lamp 42 is connected to the connection point of the second and third FETs 36 and 37 via an inductor 40 and a capacitor 78 in series.

  A lamp voltage detection circuit 76 and a capacitor 79 are connected in parallel to the series circuit of the high-pressure discharge lamp 42 and the lamp current detection circuit 73, respectively. The third FET 37 is connected in parallel with a diode 82 having a reverse polarity through a capacitor 80 and a resistor 81 in series. The anode of the diode 83 is connected to the connection point between the resistor 81 and the cathode of the diode 82. The diode 83 has a cathode connected to the cathode of the constant voltage diode 84 and one end of the capacitor 85. The other end of the anode of the constant voltage diode 84 and the capacitor 85 is connected to the anode of the diode 82.

  The connection point between the anodes of the diode 83 and the constant voltage diode 84 and one end of the capacitor 85 connects the diode 86 to the positive terminal of the smoothing capacitor 63 via the forward polarity.

The second and third FETs 36 and 37 are turned on and off in a high-frequency cycle by an integrated circuit (IC-1) 451 made of an analog IC using the first control means as a first control means. The integrated circuit (IC-2) 57 as the second control means takes in the lamp voltage detection signal from the lamp voltage detection circuit 76 and digitally converts the lamp current detection signal from the lamp current detection circuit 73 and takes in the lamp power. Calculate. Then, the frequency or on-duty of the second and third FETs 36 and 37 or the output voltage of the boost chopper circuit 25 is controlled so that the lamp power becomes constant.
Other configurations are the same as those of the third embodiment described above.

  In the inverter circuit 352 having such a configuration, a high voltage is generated by a resonance circuit of the inductor 40 and the capacitor 79 and applied to the high-pressure discharge lamp 42 at the time of startup and restart. Therefore, the starting circuit can be dispensed with.

  At the time of starting or restarting, as in the third embodiment, the integrated circuit (IC-2) 57 as the second control means turns off the sixth FET 60 for a predetermined time required for starting each part. To maintain. As a result, a voltage of 15V is generated in the smoothing capacitor 54 of the step-down regulator 55, and a voltage of approximately 15V is generated in the smoothing capacitor 63. The voltage of the smoothing capacitor 63 becomes the power supply voltage of the integrated circuit (IC-1) 451 and the integrated circuit (IC-3) 31.

  In this way, the integrated circuit (IC-1) 451 and the integrated circuit (IC-3) 31 are reliably activated. When the integrated circuit (IC-1) 451 and the integrated circuit (IC-3) 31 are activated, the boost chopper circuit 25 starts its operation, and the inverter circuit 352 also starts its operation.

  When the inverter circuit 352 operates, a predetermined voltage is generated on the cathode side of the diode 83, and this voltage is applied to the smoothing capacitor 63 via the diode 86. Thus, during the operation of the inverter circuit 352, the smoothing capacitor 63 is charged via the diode 86, and a voltage of 12V or more, for example, approximately 15V is maintained.

  Also in this apparatus, the DC voltage generated in the smoothing capacitor 54 is supplied to the three-terminal regulator 56 and also supplied to the smoothing capacitor 63 via the diode 62, and the three-terminal regulator 56 receives the input DC voltage. Is stepped down to 3.3V. The three-terminal regulator 56 performs the operation of stepping down the voltage of 5V to 3.3V for a long time, so that a wasteful step-down voltage becomes extremely small. Accordingly, the step-down voltage in the three-terminal regulator 56 can be reduced and the power loss can be reduced as in the embodiment described above.

(Fifth embodiment)
In this embodiment, a lighting device using any one of the high pressure discharge lamp lighting devices described in the second to fourth embodiments will be described.
As shown in FIG. 8, the high pressure discharge lamp lighting device 100 is installed separately from the lighting fixture main body 101. The luminaire main body 101 is provided with a concave reflecting shade 102 and a socket (not shown) is provided at the inner center of the reflecting shade 102. The base of the high pressure discharge lamp 42 is screwed into this socket, and the high pressure discharge lamp is loaded. The discharge lamp lighting device 100 has the same configuration as the high pressure discharge lamp lighting device described in the second embodiment.

  Since the high pressure discharge lamp lighting device 100 used in the lighting device having such a configuration has the same configuration as any of the high pressure discharge lamp lighting devices described in the second to fourth embodiments, the control power supply device A three-terminal regulator that inputs a DC power supply from and reduces the DC voltage to a voltage of 3.3 V can reduce the voltage that must be stepped down and reduce power loss.

In addition, it is not necessary to continue to flow current using resistors to secure the control power supply voltage during the period when the start circuit stops generating high-voltage pulses, which suppresses the generation of unnecessary power consumption. it can.
Accordingly, the lighting device can reduce power loss and suppress generation of wasteful power consumption.

The figure which shows the circuit structure of the power supply device for control based on the 1st Embodiment of this invention. The figure which shows the voltage waveform of each part in the embodiment. The figure which shows the circuit structure of the high pressure discharge lamp lighting device based on the 2nd Embodiment of this invention. The figure which shows the circuit structure of the high pressure discharge lamp lighting device based on the 3rd Embodiment of this invention. The signal and voltage waveform diagram which show the operation | movement of each part at the time of starting at the time of starting a high pressure discharge lamp smoothly in the same embodiment, or restarting. The signal and voltage waveform diagram which show the operation | movement of each part at the time of starting or restarting when the high pressure discharge lamp cannot be lighted smoothly in the same embodiment. The figure which shows the circuit structure of the high pressure discharge lamp lighting device based on the 4th Embodiment of this invention. The perspective view which shows the external appearance of the illuminating device based on the 5th Embodiment of this invention.

Explanation of symbols

  6, 55 ... step-down regulator, 7, 56 ... three-terminal regulator (second control voltage supply means), 8, 57 ... integrated circuit (IC-2) (second control means), 10, 12, 59, 61 ... constant voltage diode, 11, 60 ... FET, 13, 62 ... rectifying diode, 14, 63 ... second smoothing capacitor, 15, 45, 451 ... integrated circuit (IC-1) (first control means), 25 ... Boost chopper circuit (DC power supply), 35 ... Inverter circuit (lighting circuit), 50 ... Power supply for control.

Claims (5)

First control means that operates by supplying a predetermined voltage ;
A DC power supply for supplying a DC power supply voltage ;
Voltage dropping means for stepping down the DC power supply voltage to a first DC voltage lower than the DC power supply voltage and a second DC voltage lower than the first DC voltage ;
Second control means for controlling the voltage step-down means to step down the DC power supply voltage to the first and second DC voltages, and operating at a lower voltage than the first control means;
Voltage supply means for converting the first and second DC voltages output from the voltage step-down means to a voltage lower than the second DC voltage and supplying the converted voltage as a power source for the second control means;
Smoothing means for smoothing the first and second DC voltages output from the voltage step-down means and supplying them as a power source for the first control means ;
A control power supply device comprising: A DC power supply for supplying a DC power supply voltage ;
A lighting circuit connected to the DC power source and lighting the discharge lamp;
Voltage dropping means for stepping down the DC power supply voltage to a first DC voltage lower than the DC power supply voltage and a second DC voltage lower than the first DC voltage;
A first control means that controls the lighting circuit;
The voltage step-down means controls the direct-current power supply voltage to step down to the first and second direct-current voltages, and controls the first control means so that the discharge lamp power becomes constant, and the first control Second control means operating at a lower supply voltage than the means;
Voltage supply means for converting the first and second DC voltages output from the voltage step-down means to a voltage lower than the second DC voltage and supplying the converted voltage as a power source for the second control means;
Smoothing means for smoothing the first and second DC voltages output from the voltage step-down means and supplying them as a power source for the second control means ;
A discharge lamp lighting device comprising: The voltage step-down unit, a discharge lamp lighting device according to claim 2, wherein when starting the DC power supply or lighting circuit, or at the time of restart and outputs the first DC voltage. The voltage step-down means, wherein during operation dormant or stopping of the lighting circuit discharge lamp lighting device according to claim 2 or 3, wherein the outputs of said second DC voltage. A lighting fixture body;
The discharge lamp lighting device according to any one of claims 2 to 4, which is attached to the lighting fixture body;
A discharge lamp disposed in the luminaire body;
An illumination device comprising:

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