JPH1127953A - Power supply, discharge lamp operating device and illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive power supply, discharge lamp operating device and illumination device with simple circuitry without reducing the resistance value for starting. SOLUTION: A series circuit comprising a resistor 61 for starting and a capacitor 62 as a first drive power supply is connected between the output terminals on a rectifier 20, and both ends of the capacitor 62 is connected with the drive power supply of a chopper controlling means 60. A secondary winding 22a coupled magnetically is provided on the inductor 22 of a chopper circuit 25, with one end connected with the negative pole of the rectifier and the other end connected with the connecting point of the resistor 61 and the capacitor 62 though a series circuit comprising a diode 63, a resistor 64 and a diode 65. A capacitor 66 as second drive power supply is connected with the connecting point of the negative pole of the rectifier, the diode 63 and the resistor 64 to form a rectifying smoothing circuit 67. A series circuit comprising a diode 71 and a capacitor 72 as a third drive power supply is connected between the negative pole of the rectifier and the connecting point of the resistor 64 and the diode 65 and is connected with the drive power supply of an inverter-controlling means 70.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device, a discharge lamp lighting device, and a lighting device in which a chopper circuit and an inverter circuit are combined.

[0002]

2. Description of the Related Art A power supply device combining a chopper circuit and an inverter circuit of this type is disclosed in, for example,
No. 76969, which is shown in FIG. 6 or FIG. 6 is a chopper circuit 1 having an inductor L1 and a diode D1 connected to a rectified and smoothed DC power supply (not shown).
00, an inductor L1 is provided with a secondary winding L2.
The starting resistor R connected to the secondary winding L2 and the DC power supply
1. Capacitor C1, capacitor C2, capacitor C
3, a diode D2, a diode D3, a resistor R2, and a resistor R3 are connected to form a DC power supply, and the chopper control circuit 110 and the inverter control circuit 12
0 is connected. When the DC power supply is turned on, the chopper control circuit 110 and the inverter control circuit 120 are started via the starting resistor R1, and thereafter, the chopper control circuit 110 and the inverter control circuit 120 are driven using the DC power supply as a power supply. . Chopper control circuit 11
0 and the drive power supply circuit of the inverter control circuit 120 are used as a common power supply. On the other hand, the power supply device (conventional example 2) shown in FIG. 7 supplies driving power for the chopper control circuit 210 from the secondary winding L2 of the inductor L1 of the chopper circuit 200, and supplies driving power for the inverter control circuit 220 to the inverter circuit 230. The output voltage is supplied as DC. The starting resistor R1 is connected to a power supply that converts the output voltage of the inverter circuit 230 into a direct current, and supplies power to the chopper control circuit 210 from the power supply during startup to supply power to the chopper control circuit 21.
0 is driven. Driving power for the chopper control circuit 210 and the inverter control circuit 220 is supplied from independent power supply circuits. FIG. 8 shows another known power supply device. The power supply device (conventional example 3) shown in FIG. 8 includes a starting resistor R1 and a field effect transistor FET1 connected in series to form a chopper control circuit 31.
0 and a common drive power supply for the inverter control circuit 320. The field effect transistor FET1 is turned on only at the time of startup and power is supplied through the startup resistor R1, and during normal operation of the chopper control circuit 310 and the inverter control circuit 320, the field effect transistor FET1 is turned on.
1 is turned off and the starting resistor R1 is disconnected.

[0003]

In the power supply device according to the prior art 1, the startup resistance must be reduced in order to supply power to both the chopper control circuit and the inverter control circuit at the time of startup. There is a disadvantage that the power loss increases. The power supply device of Conventional Example 2 has the drawback that the number of components is increased and the circuit configuration is complicated. The power supply device of Conventional Example 3 eliminates the power loss of the starting resistor during normal operation, but has the disadvantage of being expensive since a switch element is required.

The present invention has been made in view of the above problems, and has as its object to provide an inexpensive power supply device, discharge lamp lighting device, and lighting device with a simple circuit configuration without reducing the resistance value of a starting resistor. And

[0005]

According to the present invention, there is provided a power supply apparatus comprising: a DC converter for converting a commercial AC into a DC; a chopper circuit connected to the DC converter and having an inductor and a switch element; An inverter circuit having a main switch element for converting the output of the chopper circuit into a high frequency; a load energized by the inverter circuit; an inductive interposed between the inverter circuit and the load to limit the output of the inverter circuit A chopper control means for controlling the operation of the switch element of the chopper circuit; an inverter control means for controlling the operation of the switch element of the inverter circuit; A first drive power supply for supplying power to one of the control means and starting up; one of the chopper control means and the inverter control means After moving, the second driving power source to power their both control means; are provided with.

In the present invention and each of the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.

The chopper circuit may be either a step-up type or a step-down type.

The load may be any one that can be energized by an inverter, such as a motor, a heating wire, an incandescent lamp, or a discharge lamp.

The input of the first drive power supply may be either commercial AC or DC such as full-wave rectified or smoothed full-wave rectified.

When the commercial power supply is turned on, the chopper control means or the inverter control means is activated by being supplied with power from the first drive power supply. The activated control means controls the operation of the switch element of the chopper circuit or the inverter circuit by turning on and off. When the operation of the switch element of the chopper circuit or the inverter circuit is controlled, the second drive power supply is activated to supply DC drive power to the chopper control means and the inverter control means. The chopper control means controls on / off of the switch element of the chopper circuit so that the input current has a high power factor. Further, the inverter control circuit controls on / off of a switch element of the inverter circuit to supply a high frequency to a load.

Since the first drive power supply is connected to either the chopper control means or the inverter control means, the power at the time of startup is small and the power loss at the time of normal operation is small.

According to a second aspect of the present invention, in the power supply device according to the first aspect, the second driving power source is a first driving power source.
And a device for intermittently supplying power from the first drive power source to the second drive power source is interposed.

The element for blocking the current supply may be any element that blocks the current supply from the first drive power supply to the second drive power supply and also supplies the current from the second drive power supply to the first drive power supply. Can be used.

Since no power is supplied from the first drive power supply to the second drive power supply, the power supply voltage of the first drive power supply can be secured, and the chopper control means or the inverter control means is started immediately at the time of startup.

According to a third aspect of the present invention, there is provided a power supply apparatus comprising: a DC converter for converting a commercial AC into a DC; a chopper circuit connected to the DC converter and having an inductor and a switch element; An inductive element interposed between the inverter circuit and the load to limit the output of the inverter circuit; and an input or output of the DC converting means. A first series body of a starting resistor and a first capacitor connected to one end; a secondary winding magnetically coupled to one of an inductor and an inductive element of the chopper circuit; and a parallel to the first capacitor. A control circuit for controlling one of the chopper circuit and the inverter circuit;
A second capacitor connected to smooth the output of the secondary winding; a second series body of an impedance element and a first diode forming a current path from the second capacitor to the first capacitor; A third series body having a second diode and a third capacitor connected to the midpoint of the series body of the impedance element and the first diode; and
And a control circuit that is connected in parallel to the capacitor and controls the other circuit.

As the inductive element, for example, an inductor can be used.

The starting resistor may be directly connected to one end of the input or output of the DC converting means, or may be connected to one end of the input or output of the DC converting means via a circuit element.

One of a control circuit for controlling the chopper circuit and a control circuit for controlling the inverter is connected in parallel with the first capacitor, and the third capacitor is connected to the first capacitor.
A control circuit for controlling the chopper circuit or a control circuit for controlling the inverter, which is not connected in parallel with the capacitor, is connected in parallel. When the commercial power is turned on, the first capacitor is charged via the starting resistor, and power is supplied to a control circuit for controlling a chopper circuit or a control circuit for controlling an inverter as a driving power source to start the circuit. The started control circuit controls the operation of the switch element of the chopper circuit or the inverter circuit. When the operation of the switch element of the chopper circuit or the inverter circuit is controlled, an output is generated in the secondary winding magnetically coupled to one of the inductor and the inductive element of the chopper circuit. The output is smoothed and supplied to a control circuit for controlling the chopper circuit and a control circuit for controlling the inverter as drive power. A control circuit for controlling the chopper circuit controls on / off of a switch element of the chopper circuit so as to reduce reactive power. Further, a control circuit for controlling the inverter controls on / off of a switch element of the inverter circuit to supply a high frequency to a load.

Since the starting resistor is connected to either the control circuit for controlling the chopper circuit or the control circuit for controlling the inverter, the resistance value can be increased, and the power for starting can be reduced. Low power loss during normal operation.

According to a fourth aspect of the invention, there is provided a discharge lamp lighting device according to any one of the first to third aspects, wherein the load is a discharge lamp.

A high power factor discharge lamp lighting device with reduced power loss can be provided.

According to a fifth aspect of the present invention, there is provided a lighting fixture comprising: a lighting fixture main body; and a discharge lamp lighting device according to the fourth aspect, which is housed in the lighting fixture main body.

Since the discharge lamp lighting device with a high power factor is mounted, it is possible to provide a lighting fixture with an increased commercial value.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing a first embodiment of the present invention, and FIG. 5 is a lighting fixture incorporating a discharge lamp lighting device of the present invention. 1 and 5, the same parts are denoted by the same reference numerals.

The lighting fixture 5 shown in FIG.
Lamp sockets 7, 7 are provided at both ends of the lower surface of the lamp. A fluorescent lamp 8 as a discharge lamp is sandwiched and connected between the lamp sockets 7, 7. A reflecting surface 9 is formed so as to be optically opposed to the fluorescent lamp 8, and the discharge lamp lighting device 1 is built in the inner side of the reflecting surface 9.

As shown in FIG. 1, the discharge lamp lighting device 1 is configured by combining a boost chopper circuit and an inverter circuit. In FIG. 1, reference numeral 20 denotes a rectifier comprising a diode bridge as a DC converter, and its input is supplied from a commercial AC power supply E. Rectifier 20
A low-pass filter 13 composed of a capacitor 10, a capacitor 11, and an inductor 12 is connected between the power supply E and the commercial AC power supply E via a fuse F1. A low-pass capacitor 21 for removing high frequency is connected between the output terminals of the rectifier 20, and an inductor 22
Field effect transistor 2 as a switching element
3 and a series circuit of the resistor 24 are connected. A series circuit of the inductor 22, the field effect transistor 23, and the resistor 24 forms a boost chopper circuit 25. A smoothing capacitor 31 is connected to the output side of the step-up chopper circuit 20 via a diode 30 as a rectifying element, and the diode 30 and the smoothing capacitor 31 are connected to the rectifying / smoothing circuit 3.
2 and its output is connected to the input of the inverter circuit 40. The inverter circuit 40 is configured by a half bridge of field effect transistors 41 and 42 as main switching elements, and both ends of the field effect transistor 42 are output terminals of the inverter circuit 40. The output of the inverter circuit 40 is connected to the fluorescent lamp 8 as a load, and the field effect transistor 41 and the field effect transistor 4
An inverter circuit 40 is provided between the connection point 2 and the fluorescent lamp 8.
A series circuit of an inductor 51 as an inductive element for limiting the output of the inverter and a capacitor 52 for cutting off the high frequency is connected. A preheating capacitor 53 is connected between the filaments 8a and 8b of the fluorescent lamp 8.

Further, between the output terminals of the rectifier 20, a starting resistor 61 and a capacitor 62 as a first drive power supply are provided.
A (first capacitor) series circuit (first series body) is connected. Both ends of the capacitor 62 are connected to a drive power source of the chopper control means 60, and supply power using the capacitor 62 as a power source. A control line 60a is connected from the chopper control means 60 to the gate of the field effect transistor 23 of the chopper circuit 25, and the chopper control means 60 controls the operation of the field effect transistor 23 on and off. The secondary winding 2 magnetically coupled to the inductor 22 of the chopper circuit 25
2a, and one end of the secondary winding 22a is connected to the rectifier 2a.
0 negative terminal (connected to ground not shown)
And the other end is connected to a diode 63, a resistor 64 as an impedance element, and a diode 65 (first
Are connected to a connection point of the resistor 61 and the capacitor 62 through a series circuit (second series body) of a diode. A smoothing capacitor 66 (second capacitor) as a second drive power supply is connected between the diode 63 and the negative terminal of the rectifier 20, and the diode 63 and the smoothing capacitor 6 are connected.
6 form a rectifying / smoothing circuit 67. Diode 65
Is an element for blocking the supply of electricity from the first drive power supply to the second drive power supply. The resistor 64 is connected to the chopper control unit 60.
First drive power supply and an inverter control means 70 described later.
Of the third driving power supply. Resistance 64
A series circuit (third series) of a diode 71 (second diode) and a smoothing capacitor 72 (third capacitor) as a third driving power source is provided between the connection point of the diode 65 and the negative terminal of the rectifier 20. ), And both ends of the capacitor 72 are connected to the drive power supply of the inverter control means 70, and power is supplied using the voltage across the capacitor 72 as the power supply. Diode 71 is replaced by resistor 64 and diode 65
, The diode 71 and the diode 65 are connected to the capacitor 6 as a first drive power supply.
2 and a capacitor 72 as a third drive power supply
Are prevented from passing through each other. Note that the capacitors 62 and 72 also have a role of blocking high frequencies superimposed from the chopper control means 60 and the inverter control means 70. The inverter control means 70 and the field effect transistors 41 and 42 of the inverter circuit 40 are connected by control lines 70a and 70b, respectively.
The inverter control means 70 includes the field effect transistor 41,
The on / off control of the operation of 42 is performed.

Next, the operation of the present embodiment will be described.

When the commercial AC power supply E is turned on, a full-wave rectified voltage is generated between the output terminals of the rectifier 20. This full-wave rectified voltage is applied to a series circuit of a starting resistor 61 and a capacitor 62 as a first drive power source, and the voltage across the capacitor 62 gradually increases. At this time, the capacitor 62 and the capacitor 66 are connected in parallel via the resistor 64 and the diode 65, but the diode 65 is reversely connected from the capacitor 62 side so as to prevent the capacitor 62 from flowing to the capacitor 66. The diode 65 is connected to the chopper control means 60 and the inverter control means 70.
Is also blocked. Therefore, the capacitor 62 is rapidly charged in a time determined by the time constant of the starting resistor 61 and the capacitor 62. When the capacitor 62 is charged and the voltage between both ends reaches a voltage (for example, 10 to 15 V) for driving the chopper control means 60, the chopper control means 60
Turns on / off the field effect transistor 23 of the chopper circuit 20.

When the field effect transistor 23 of the chopper circuit 20 operates, a high-frequency current flows through the inductor 22,
A high-frequency voltage is generated in the secondary winding 22a. This voltage is
The voltage is converted to a constant voltage Va (for example, 18 V) by the rectifying / smoothing circuit 67 and becomes a second drive power supply. The constant voltage Va charges the capacitor 72, which is the third drive power supply, via the resistor 64 and the diode 71. When the capacitor 72 is sufficiently charged, the inverter control means 70 is driven. When the inverter control means 70 is driven, the inverter control means 70
Are the field effect transistors 41 and 4 of the inverter circuit 40
The high frequency voltage is generated at the output of the inverter circuit 40 by ON / OFF control of the operation 2 and applied to the fluorescent lamp 8. The filaments 8a and 8b of the fluorescent lamp 8 are lit after being preheated via the preheating capacitor 53. Normally, the drive power of the inverter control means 70 is supplied with the voltage across the capacitor 72 as the third drive power. On the other hand, the voltage between both ends of the capacitor 66 as the second drive power supply is supplied to the capacitor 62 as the first drive power supply via the resistor 64 and the diode 65, and the drive power supply of the chopper control means 60 is normally the first drive power supply. Is supplied with the voltage between both ends of the capacitor 62 as a driving power source for the power supply. The resistor 64 is used for voltage adjustment, and may be appropriately set in accordance with the voltage difference between the two ends of the capacitor 66, which is the second drive power supply, and the drive power supply of the chopper control means 60 and the drive power supply of the inverter control means 70.

In this embodiment, the inverter control means 7
0 as a third drive power source with a drive power source of
Of the chopper circuit 25
Power may be directly supplied from the capacitor 66 as the second drive power supply except for the voltage adjustment resistor 64 and the diode 71 by appropriately setting the number of turns of the next winding 22a.

Since the voltage across the capacitor 62 as the first drive power source becomes the drive power source for only the chopper control means 60 at the time of startup and when the inverter circuit is stopped, for example, both the chopper control means 60 and the inverter control means 70 More current than the drive power supply
Since there is no need to charge 2, the resistance value of the starting resistor 61 can be increased. That is, the current flowing through the resistor 61 can be small, and the power loss of the resistor 61 can be small.

Next, a second embodiment of the present invention will be described.

FIG. 2 is a circuit diagram of a discharge lamp lighting device according to a second embodiment of the present invention. The discharge lamp lighting device 2 shown in FIG. 2 is built in the lighting fixture 5 shown in FIG. 2, the same parts as those of FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted.

A starting resistor 6 is connected between the output terminals of the rectifier 20.
1 and a series circuit (first series body) of a capacitor 72 (first capacitor) as a first drive power supply. Both ends of the capacitor 72 are connected to the inverter control means 7.
0, and is supplied with the voltage between both ends of the capacitor 72 as a power supply. The inductor 51 has a secondary winding 51 a that is magnetically coupled, and the secondary winding 51 a is connected to the rectifying and smoothing circuit 67. Rectifier smoothing circuit 67
The smoothing capacitor 66 (second capacitor) serves as a second drive power supply, and converts a high-frequency voltage generated in the secondary winding 51a into a constant voltage Va (for example, 18 V) and outputs the same. Rectifier smoothing circuit 67 (second drive power supply)
Is output from a series circuit (second circuit) of a resistor 64 as an impedance element and a diode 71 (first diode).
Are connected in parallel with a capacitor 72 as a first drive power supply. Furthermore, a series circuit (third circuit) of a resistor 64 and a diode 65 (second diode)
Are connected to a capacitor 62 as a third drive power supply. Both ends of the capacitor 62 are connected to the drive power source of the chopper control means 60,
Is supplied as a power supply. Here, the diode 71 is an element for preventing the power supply from the capacitor 72 as the first drive power supply to the capacitor 66 as the second drive power supply. Further, by connecting the diode 65 to the connection point between the resistor 64 and the diode 71, the diode 65 and the diode 71 are connected to the voltage between both ends of the capacitor 72 as the first drive power supply and the voltage between both ends of the capacitor 62 as the third drive power supply. Are prevented from energizing each other. Note that the capacitors 72 and 62
Are inverter control means 70 and chopper control means 60
It also plays a role in blocking the high frequency superimposed from the noise.

Next, the operation of the second embodiment will be described.

When the commercial AC power supply E is turned on, a full-wave rectified voltage is generated between the output terminals of the rectifier 20. This full-wave rectified voltage is applied to a series circuit of a starting resistor 61 and a capacitor 72 as a first drive power source, and the voltage across the capacitor 72 gradually increases. At this time, since no current flows through the inductor 51, no output voltage is generated on the secondary winding 51a. Further, the capacitor 72 and the capacitor 66 are connected in parallel via the resistor 64 and the diode 71, but the diode 71 is reversely connected from the capacitor 72 side so as to prevent conduction from the capacitor 72 to the capacitor 66. Also, the diode 65 prevents the chopper control unit 60 and the inverter control unit 70 from being energized. Therefore, the capacitor 72 is rapidly charged in a time determined by the time constant of the starting resistor 61 and the capacitor 72. The capacitor 72 is charged and the voltage across the capacitor 72 drives the inverter control means 70 (for example, 10 to 15).
V), the inverter control means 70 sets the control line 70
The field effect transistors 41 and 42 of the inverter circuit 40 are turned on and off via the terminals 70a and 70b.

When the field effect transistors 41 and 42 of the inverter circuit 40 operate, a high frequency voltage is generated at the output of the inverter circuit 40 and applied to the fluorescent lamp 8. Then, the filaments 8a and 8b of the fluorescent lamp 8 are lit after being preheated via the preheating capacitor 53. At the time of preheating and lighting of the fluorescent lamp 8, a high-frequency current flows through the inductor 51, and a high-frequency voltage is generated at the secondary winding 51a. This high-frequency voltage is supplied to a constant voltage Va by a rectifying / smoothing circuit 67.
(For example, 18 V) and becomes the second drive power supply.
The constant voltage Va charges the capacitor 62, which is the third drive power supply, via the resistor 64 and the diode 65. When the capacitor 62 is sufficiently charged, the chopper control means 60 is driven. When the chopper control means 60 is driven, the chopper control means 60 controls the operation of the field effect transistor 23 of the chopper circuit 25 on and off to increase the power factor of the input of the discharge lamp lighting device 2. During a stable operation, the chopper control unit 60 is supplied with power by a capacitor 62 as a third drive power supply. On the other hand, the voltage across the capacitor 66 as the second drive power supply is supplied to the capacitor 72 as the first drive power supply via the resistor 64 and the diode 71, and during stable operation, the drive power supply for the inverter control means 70 The voltage between both ends of the capacitor 72 as one drive power supply is supplied. The resistor 64 is used for voltage adjustment, and may be appropriately set according to the voltage difference between the both ends of the capacitor 66, which is the second drive power supply, and the drive power supplies of the inverter control means 70 and the chopper control means 60.

In the second embodiment, the chopper control means 6
0 as a third drive power source with a drive power source of 0
Is supplied from the voltage between both ends of the inductor 51. However, the number of turns of the secondary winding 51a of the inductor 51 is appropriately set, and the voltage is directly supplied from the capacitor 66 as the second drive power supply except for the voltage adjusting resistor 64 and the diode 65. Power may be supplied.

The voltage between both ends of the capacitor 72 as the first drive power source is used as a drive power source for the inverter control means 70 only at the time of startup and when the inverter circuit 40 is stopped. Since it is not necessary to charge the capacitor 72 with a larger current than in the case of using both drive power supplies, the starting resistor 6
1 can be increased. That is, the current flowing through the resistor 61 can be small, and the power loss of the resistor 61 can be small.

Next, a third embodiment of the present invention will be described.

FIGS. 3 and 4 are circuit diagrams of a discharge lamp lighting device according to a third embodiment of the present invention. The discharge lamp lighting device 3 shown in FIG. 3 and the discharge lamp lighting device 4 shown in FIG. 4 are built in the lighting fixture 5 shown in FIG. 3 and 4
In the figure, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The discharge lamp lighting device 3 shown in FIG. 3 is different from the first embodiment shown in FIG.
1a is connected to a commercial AC power supply E. When the commercial AC power supply E is turned on, a half-wave DC voltage is applied to a series circuit of a starting resistor 61 and a capacitor 62 as a first drive power supply, and the capacitor 62 is charged.

The discharge lamp lighting device 4 shown in FIG. 4 is different from the first embodiment shown in FIG.
1a is connected to a connection point between a diode 30 for rectifying and smoothing the output of the chopper circuit 25 and a smoothing capacitor 31. When the commercial AC power supply E is turned on, a full-wave DC voltage is generated between the output terminals of the rectifier 20. This full-wave DC voltage is converted to a constant voltage DC by the rectifying and smoothing circuit 32 via the inductor 22. This constant voltage is equal to the starting resistor 6.
The capacitor 62 is charged by being applied to the series circuit of the first and the first drive power supply 62.

As shown in FIGS. 1 to 4, the starting resistor 6
The first input 61a may be connected to either the commercial AC power supply E side or the output side of the rectifier 20 as long as the capacitor 62 or the capacitor 72 as the first starting power supply is charged with DC through the resistor 61. Good. In addition, the starting resistor 61
May be connected to either the capacitor 62 connected to the drive power supply of the chopper control means 60 or the capacitor 72 connected to the drive power supply of the inverter control means 70. Further, the input of the capacitor 66 as the second drive power supply is connected to either the secondary winding 22a of the inductor 22 of the chopper circuit 25 or the secondary winding 51a of the inductor 51 for limiting the high frequency output of the inverter circuit 40. You may.

In the first to third embodiments of the present invention, a discharge lamp lighting device for a fluorescent lamp whose load is a discharge lamp has been described. However, the present invention includes a chopper circuit and an inverter circuit and is controlled by an inverter circuit. The present invention is applied to a power supply device.

[0048]

According to the first aspect of the present invention, since the first drive power supply is connected to either the chopper control means or the inverter control means, power loss is reduced and circuit efficiency is improved.

According to the second aspect of the present invention, the power supply voltage of the drive power supply at the time of starting can be immediately secured, and the chopper control means or the inverter control means can be started.

According to the third aspect of the present invention, since the resistance value of the starting resistor can be increased, the power loss is reduced and the circuit efficiency is improved.

According to the fourth aspect of the present invention, it is possible to provide a discharge lamp lighting device having a reduced power loss and a high power factor.

According to the fifth aspect of the present invention, it is possible to provide a lighting fixture capable of reducing power loss, similarly to the effect of the fourth aspect of the present invention.

[Brief description of the drawings]

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

FIG. 2 is a circuit diagram of a discharge lamp lighting device according to a second embodiment of the present invention.

FIG. 3 is a circuit diagram of a first discharge lamp lighting device according to a third embodiment of the present invention.

FIG. 4 is a circuit diagram of a second discharge lamp lighting device according to a third embodiment of the present invention.

FIG. 5 is a lighting fixture incorporating the discharge lamp lighting device of the present invention.

FIG. 6 is a circuit diagram showing a first conventional discharge lamp lighting device.

FIG. 7 is a circuit diagram showing a second conventional discharge lamp lighting device.

FIG. 8 is a circuit diagram showing a third conventional discharge lamp lighting device.

[Explanation of symbols]

1, 2, 3, 4 discharge lamp lighting device 5 lighting equipment 8 fluorescent lamp 20 rectifier 22 inductor 22a secondary winding 25 chopper circuit 40 inverter circuit 51 inductor 51a secondary winding 60 chopper control means 61 starting resistor 62 capacitor ( (First drive power supply or third drive power supply) 65 diode 66 capacitor (second drive power supply) 70 inverter control means 71 diode 72 capacitor (third drive power supply or first drive power supply)

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI H05B 41/29 H05B 41/29 C

Claims (5)

[Claims] 1. A DC converting means for converting a commercial AC into a DC; a chopper circuit connected to the DC converting means and having an inductor and a switch element; and an inverter circuit having a main switch element for converting an output of the chopper circuit into a high frequency. A load energized by the inverter circuit; an inductive element interposed between the inverter circuit and the load to limit an output of the inverter circuit; a chopper control means for controlling an operation of a switch element of the chopper circuit An inverter control means for controlling the operation of the switch element of the inverter circuit; a first drive power supply for supplying a DC drive power to one of the chopper control means and the inverter control means to start the DC drive power supply at the start of the operation of the DC conversion means; After one of the chopper control means or the inverter control means is activated, a drive power supply for both control means is generated That the second driving power source; power supply device, characterized in that it comprises a. A second drive power supply connected in parallel to the first drive power supply and a second drive power supply connected to the second drive power supply;
2. The power supply device according to claim 1, further comprising an element for preventing power supply to the drive power supply. 3. A DC converting means for converting commercial AC into DC; a chopper circuit connected to the DC converting means and having an inductor and a switch element; an inverter circuit for converting an output of the chopper circuit into a high frequency; A load to be energized; interposed between the inverter circuit and the load;
An inductive element that limits the output of the inverter circuit; a first series body of a starting resistor and a first capacitor connected to one end of the input or output of the DC conversion means; an inductor or inductive of the chopper circuit A secondary winding magnetically coupled to one of the elements; a control circuit connected in parallel to the first capacitor to control one of the chopper circuit and the inverter circuit; and to smooth the output of the secondary winding. A second capacitor connected to the second capacitor; a second series body of an impedance element and a first diode forming a current path from the second capacitor to the first capacitor; and a series of the impedance element and the first diode. A third series body having a second diode and a third capacitor connected to the midpoint of the body; a control connected to the third capacitor in parallel to control the other circuit Power supply, characterized in that it comprises a; and road. 4. The discharge lamp lighting device according to claim 1, wherein the load is a discharge lamp. 5. A lighting fixture comprising: a lighting fixture main body; and the discharge lamp lighting device according to claim 4 housed in the lighting fixture main body.