JPH0686565A - Power supply device, lighting device for discharge lamp and illumination device - Google Patents

Abstract

PURPOSE:To prevent a control circuit from erroneously operating due to currents flowing through a circuit. CONSTITUTION:In a discharge lamp lighting device 1, a main circuit portion 2 that constitutes an inverter is provided in a section 3 on a substrate and a control circuit portion 4 including an IC 16 is provided in a section 5. Further, in the discharge lamp lighting device 1, an IC stabilized potential line 25 of the control circuit portion 4 is branched off from a main circuit stabilized potential line 23 of the main circuit portion 2. An IC high potential line 15 is connected to a power supply high potential input terminal Vdd of the IC 16. The IC stabilized potential line 25 is connected to a stabilized potential terminal GRD of the IC 16. An output terminal Out of the IC 16 is connected to the gate of an FET 18 of the main circuit portion 2. With this constitution, a magnetic field applied to the control circuit portion 4 including the IC 16 can be suppressed to a low level because magnetic fields generated by a main circuit high potential line 13 and the IC stabilized potential line 25 counteract a magnetic field generated by the main circuit stabilized potential line 23. As a result, erroneous operation of the control circuit portion 4 including the IC 16 can be prevented.

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 discharge lamp lighting device for outputting a high frequency voltage to a load by turning on / off a direct current voltage by a switching element by a high frequency oscillation circuit controlled by a control circuit. The present invention relates to a lighting device, and more particularly to a power supply device, a discharge lamp lighting device, and a lighting device capable of preventing a malfunction of a control circuit.

[0002]

2. Description of the Related Art Conventionally, fluorescent lamps, metal halide lamps, mercury lamps, high-pressure sodium lamps and the like are known as discharge lamps. In a conventional discharge lamp lighting device for lighting such a discharge lamp, a high-frequency oscillation circuit is controlled by a control circuit composed of an integrated circuit (IC) in response to downsizing of the device, thereby lighting the discharge lamp. I am trying to do it. Further, in order to improve the circuit efficiency, such a discharge lamp lighting device is designed to operate with a minute current by setting the detection circuit and the circuit constituting the IC to high impedance. Therefore, the detection circuit and the circuits that make up the IC are
It was easily affected by noise.

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

In FIG. 8, reference numeral 61 is a commercial AC power supply, and one output terminal of the commercial AC power supply 61 is connected to one input terminal of a rectifier circuit 62. The other output terminal of the commercial AC power supply 61 is connected to the other input terminal of the rectifier circuit 62.

The positive output terminal of the rectifier circuit 62 is connected to the high potential wiring 63 for the main circuit, and the negative output terminal of the rectifier circuit 62 is grounded via the capacitors C61 and C62 and is also connected to the stable potential wiring 64. It is connected. A capacitor C63 for supplying main circuit power is connected between the high potential wiring 63 for main circuit and the stable potential wiring 64. With such a connection, the AC power supply voltage from the commercial AC power supply 61 is rectified and smoothed by the rectifier circuit 62 and the capacitor C63. The capacitors C61 and C62 act to remove high frequency components.

The main circuit high potential wiring 63 is connected to the IC high potential wiring 65 via a resistor R61.

High potential wiring 65 for IC and stable potential wiring 64
A Zener diode Dz61 and a capacitor C64 for supplying IC power are connected between the two.

The IC high-potential wiring 65 is connected to the high-potential power supply input terminal Vdd of the IC 66. The stable potential wiring 64 is connected to the stable potential terminal GND of the IC 66. The output terminal Out of the IC66 is N through the resistor R63.
It is connected to the base of the PN transistor Tr61 and also to the base of the PNP transistor Tr62. The IC 66 is a control circuit that controls FETs 67 and 68 described later, and uses the voltage supplied between the input terminal Vdd and the stable potential terminal GND as a power source to generate the drive pulse a61 and to output the buffer from the output terminal Out. The voltage is supplied to the base of the NPN transistor Tr61 of the amplifier 60 and to the base of the PNP transistor Tr62.

The IC high potential wiring 65 is connected to the stable potential wiring 64 through the series connection of the collector / emitter path of the NPN transistor Tr61 and the emitter / collector path of the PNP transistor Tr62. Stable potential wiring 6
4 is connected to the IC high-potential wiring 65 through the series connection of the anode / cathode path of the diode D62 and the anode / cathode path of the diode D61. The emitters of the NPN transistor Tr61 and the PNP transistor Tr62 are connected to the connection point of the diodes D62 and D61. With such a connection, the NPN transistor T
r61, PNP transistor Tr62, and diode D6
2, D61 form a buffer amplifier 60 having an amplification factor of 1. The reason for providing the buffer amplifier 60 is to prevent a current due to resonance of a capacitor C66 and a coil L62, which will be described later, from flowing back to the output terminal Out of the IC66. A connection point of the diodes D62 and D61 is an output terminal of the buffer amplifier 60, is connected to a gate of a field effect transistor (hereinafter referred to as FET) 68 via a resistor R62, and is connected to a capacitor C66 and a coil L62. It is connected to the stable potential wiring 64 via a series connection. The high potential wiring 63 for the main circuit is
The drain / source path of the FET 67 and the drain / source path of the FET 68 are connected in series to the stable potential wiring 64. The source of FET67 is capacitor C
It is connected to the gate of the FET 67 through the series connection of the coil 65 and the coil L61. The coils L61 and L62 are wound in opposite directions using the same core 69. As a result, the voltages applied to the gates of the FETs 67 and 68 have phases opposite to each other. FET
The connection point of the series connection of 67 and 68 is connected to the middle point of the ballast coil L64 via the coil L63.
One end and the other end of the coil L64 are connected to the discharge lamp 70,
71 is connected to one electrode. Discharge lamps 70, 71
The other electrode of is connected to the stable potential wiring 64 via the capacitor C70. Starting capacitors C68 and C69 are connected in parallel to the discharge lamps 70 and 71, respectively. The starting capacitors C68 and C69 are the discharge lamp 7
Before starting 0 and 71, it is set to resonate with the coil L63.

In such a conventional discharge lamp lighting device, the AC power supply voltage from the commercial AC power supply 61 is rectified by the rectifier circuit 62 and the capacitor C for supplying the main circuit power is supplied.
It is smoothed by 63, is given to the series connection of FETs 67 and 68, and is made into a constant voltage by the capacitor C64 for supplying the IC power and the Zener diode Dz61 via the resistor R61, and by the low voltage wiring 65 and the stable potential wiring 64, It is supplied to the IC 66 and the buffer amplifier 60, which causes the IC 66 to drive the drive pulse a61.
Occurs. The drive pulse a61 is guided to the connection point of the resistor R62 and the capacitor C66 via the buffer amplifier 60. As a result, the FETs 67 and 68 are turned on / off in opposite phases.

When the FET 67 is turned on and the FET 68 is turned off, the current from the main circuit high potential wiring 63 flows into the midpoint of the coil L64 via the FET 67 and the coil L63, and the current flowing into the midpoint of the coil L64 is It splits and flows to the discharge lamps 70 and 71, and merges again to form a condenser C7.
0 flows in.

When the FET 67 is turned off and the FET 68 is turned on, the electric charge stored in the capacitors C68, C69, C70 is discharged, and the current due to this discharge flows into one end and the other end of the coil L64 through the discharge lamps 68, 69. The current merges at the midpoint of the coil L64 and flows into the coil L63. As described above, the FETs 66 and 67 are turned on / off by the IC 66, so that a current flows through the discharge lamps 70 and 71 to turn them on.

In such a conventional discharge lamp lighting device, since a current flows from the single capacitor C64 for supplying IC power to the IC 66 and the buffer amplifier 60, it flows to the NPN transistor Tr61 and the PNP transistor Tr62 of the buffer amplifier 60. Due to the abrupt change of the current, this current may affect the IC 66 via the stable potential wiring 64, causing the IC 66 to malfunction.

FIG. 9 is an explanatory view for explaining the arrangement position of the IC 66 of FIG. 8 on the substrate.

The substrate 72 is housed inside the lighting device and is formed in an elongated shape. In order to prevent a short circuit, the substrate 72 is formed by leaving the main circuit high voltage wiring 63 and the stable potential wiring 64 on both sides of one surface. IC6
6 is attached to the other surface of the substrate 72 at a position between the main circuit high voltage wiring 63 and the stable potential wiring 64.

IC6 of such a conventional discharge lamp lighting device
6, the direction of the current flowing through the main circuit high-voltage wiring 63 indicated by the arrow 73 and the direction of the current flowing through the stable potential wiring 64 indicated by the arrow 74 are opposite to each other. The magnetic field applied to the IC 66 by the current flowing through the circuit high-voltage wiring 63 and the magnetic field applied to the IC 66 by the current flowing through the stable potential wiring 64 are in the same direction, and a strong magnetic field is applied to the IC 66. This often causes the IC 66 to malfunction.

FIG. 10 is an explanatory view showing the arrangement of paths for supplying power to the IC 66 of FIG. 8, and the capacitor C64 for supplying IC power and the Zener diode Dz61 are shown as a DC power supply 76.

The IC 66 is formed in a rectangular box shape with the package 75 as viewed from above. Various terminals (stable potential terminal GND, high voltage power supply terminal Vdd, etc.) are provided on the opposing long sides of the package 75. Stable potential terminal GND
And the high-voltage power supply terminal Vdd are, for example, the package 75
Are provided close to each other in the same direction (right side in the drawing) of the opposite long sides of the. On the other hand, the DC power supply 76 of this IC 66
Is provided at a predetermined distance in a direction opposite to the direction in which the stable potential terminal GND and the high voltage power supply terminal Vdd are brought close to each other, and the positive terminal of the DC power supply 76 is connected to the high voltage power supply terminal Vdd by the IC high voltage wiring 65. Then, the negative terminal of the DC power supply 76 is connected to the stable potential terminal GND by the stable potential wiring 64.

As a result, most of the IC 66 is sandwiched between the IC high-voltage wiring 65 and the stable potential wiring 64, so that the substrate (the substrate 72 in FIG. 9) can be made compact. Since most of the IC 66 is affected by the magnetic field generated by the current flowing through the IC high-voltage wiring 65 and the magnetic field generated by the current flowing through the stable potential wiring 64, the IC often malfunctions.

Further, in the conventional discharge lamp lighting device, the positional relationship between the winding parts (coils L61 to L64 in FIG. 8) and the IC 66 is not taken into consideration. However, since it joins IC66,
The IC often malfunctioned.

[0021]

In the above-mentioned conventional discharge lamp lighting device, the control circuit may malfunction due to fluctuations in the current flowing to the control circuit and the influence of the magnetic field of the current flowing to various wirings and winding parts. There were many.

Therefore, an object of the present invention is to provide a discharge lamp lighting device capable of preventing the control circuit from malfunctioning due to a current flowing through the circuit, and a lighting device equipped with the discharge lamp lighting device.

[0023]

According to a first aspect of the present invention, there is provided a first and second high-potential wiring and a first stable-potential wiring, and the first stable-potential wiring. And a substrate on which a second stable potential wiring branched from is formed, and which is provided on this substrate to rectify an AC voltage from a commercial AC power source, and a first DC voltage to the first high potential wiring and the first high potential wiring. Rectifying means for generating between the stable potential wiring and the first DC voltage between the first high potential wiring and the first stable potential wiring provided on the substrate and turned on / off by a switching element. And a high-frequency oscillator circuit that outputs a high-frequency voltage,
A second DC voltage is applied using a load to which the output of the high-frequency oscillation circuit is supplied and a first DC voltage provided between the first high potential wiring and the first stable potential wiring, which is provided on the substrate. DC voltage generating means for generating a voltage between the second high potential wiring and the second stable potential wiring, and a second direct current between the second high potential wiring and the second stable potential wiring. A control circuit for controlling ON / OFF of the switching element of the high-frequency oscillation circuit using a voltage as a power source is provided.

A power supply device according to the present invention as defined in claim 3 is
Rectifying means for rectifying an AC voltage from a commercial AC power source to generate a first DC voltage, and a high-frequency oscillator circuit for turning on / off the first DC voltage from the rectifying means with a switching element to output a high-frequency voltage. A load to which the output of the high frequency oscillation circuit is supplied, a control circuit that supplies a drive signal to the switching element of the high frequency oscillation circuit to perform on / off control of the switching element, and a switching element of the high frequency oscillation circuit. It is provided in the path that supplies the drive signal,
A buffer amplifier for preventing backflow of the drive signal, a first power supply capacitor for generating a second power supply voltage by charging a current from the rectifier circuit and supplying the second power supply voltage to the control circuit, and a rectifier circuit The second power supply voltage is generated by charging the current and is supplied to the buffer amplifier.
And a capacitor for power supply.

A power supply device according to the present invention according to claim 4 is
A high-potential wiring and a stable-potential wiring for supplying power to the control circuit in a power supply device in which a high-frequency oscillation circuit controlled by a control circuit turns on / off a DC voltage with a switching element to output a high-frequency voltage and supplies the load to a load. And are formed on the substrate by extending to the side of the control circuit where the power input terminal pair is provided.

A power supply device according to the present invention according to claim 5 is
In a power supply device that has a winding component and a high-frequency oscillation circuit controlled by a control circuit turns on / off a DC voltage with a switching element to output a high-frequency voltage and supplies the load to the winding component and the control circuit. It is characterized in that they are arranged on opposite sides of the substrate.

[0027]

According to the structure of claim 1, since the magnetic field between the first stable potential wiring and the second stable potential wiring can be suppressed to a low level, the first stable potential wiring and the first stable potential wiring can be suppressed. Two
By arranging the control circuit between the stable potential wiring and the stable potential wiring, malfunction of the control circuit can be prevented.

According to the third aspect of the present invention, by providing the first and second power supply capacitors individually,
Since the current flowing through the buffer amplifier can be prevented from flowing into the control circuit, malfunction of the control circuit can be prevented.

According to the fourth aspect of the invention, the high potential wiring and the stable potential wiring for supplying power to the control circuit are formed on the substrate so as to extend to the side where the power input terminal pair of the control circuit is provided. Therefore, the magnetic field applied to the control circuit from the high potential wiring and the stable potential wiring can be suppressed to a low level, and malfunction of the control circuit can be prevented.

According to the fifth aspect of the invention, since the winding component and the control circuit are arranged on the sides of the substrate facing each other, the magnetic field applied to the control circuit by the current flowing through the winding component is suppressed to a low level. Therefore, the malfunction of the control circuit can be prevented.

[0031]

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

FIG. 1 is a circuit diagram showing an embodiment when applied to a discharge lamp lighting device of a power supply device according to the present invention.

In FIG. 1, a discharge lamp lighting device 1 includes a main circuit portion 2 which constitutes an inverter in a section 3 on a substrate (in this figure, a discharge lamp is also included in the section 3 for simplification of the drawing. In practice, it is provided on the outside of the substrate) and the control circuit section 4 including the IC 16 is provided in the section 5. The discharge lamp lighting device 1 includes the main circuit stable potential wiring 23 of the main circuit portion 2 to the IC stable potential wiring 25 of the control circuit portion 4.
Is branched.

One and the other output terminals of the commercial AC power supply 11 are connected to the main circuit section 2 so as to supply an AC power supply voltage to the main circuit section 2.

The main circuit section 2 will be described in detail below.

One output terminal of the commercial AC power supply 11 is connected to one input terminal of the rectifier circuit 12 of the main circuit section 2. The other output terminal of the commercial AC power supply 11 is connected to the main circuit unit 2
Is connected to the other input terminal of the rectifier circuit 12.

The positive output terminal of the rectifier circuit 12 is connected to the main circuit high potential wiring 13, and the negative output terminal of the rectifier circuit 12 is connected to the main circuit stable potential wiring 23. A capacitor C13 for supplying main circuit power is connected between the high potential wiring 13 for main circuit and the stable potential wiring 23 for main circuit. With such a connection, the AC power supply voltage from the commercial AC power supply 11 is rectified and smoothed by the rectifier circuit 12 and the capacitor C13. For example, the capacitors C11 and C12, which are grounded via a case, a lighting fixture, etc., are for removing high frequency components as described above.

The high potential wiring 13 for the main circuit is connected to the stable potential wiring 23 for the main circuit through the series connection of the drain / source of the FET 17 and the drain / source of the FET 18.

The gate of the FET 18 is I of the control circuit unit 4.
The output terminal Out of C16 is connected and also connected to the stable potential wiring 23 for the main circuit through the series connection of the capacitor C16 and the coil L12.

The source of the FET17 is the capacitor C16.
And a coil L12 connected in series to the gate of the FET 17. The coils L11 and L12 have the same core 1
9 is used and wound in opposite directions. As a result, the voltages applied to the gates of the FETs 17 and 18 have phases opposite to each other. FET17,1
The connection point of the series connection of 8 is connected to the middle point of the ballast coil L14 via the coil L13. Coil L
One end and the other end of 14 are connected to one electrode of the discharge lamps 20 and 21, respectively. The other electrodes of the discharge lamps 20 and 21 are connected to the main circuit stable potential wiring 23 via a capacitor C70. Resonance and starting capacitors C18 and C19 are connected in parallel to the discharge lamps 20 and 21, respectively.
Are connected.

The main circuit high-potential wiring 13 is connected to the IC high-potential wiring 15 of the control circuit section 4 via the resistor R11.

On the other hand, the main circuit stable potential wiring 23 is connected to the IC stable potential wiring 25 of the control circuit section 4.

At the connection point between the coil L14 and the discharge lamp 21,
It is connected to the IC stable potential wiring 25 through a series connection of a resistor R12 and a resistor R13 for voltage detection.

The connection point between the resistors R12 and R13 is IC
It is connected to 16 lamp power detection terminals a.

The control circuit section 4 will be described in detail below.

Between the IC high-potential wiring 15 and the IC stable-potential wiring 25, a Zener diode Dz11 and an IC power supply capacitor C14 are connected.

A high potential power supply input terminal Vdd of the IC 16 is connected to the IC high potential wiring 15. The IC stable potential wiring 25 is connected to the stable potential terminal GND of the IC 16. The output terminal Out of the IC16 is the FET1 of the main circuit section 2.
8 gates connected.

The IC 16 is a control circuit for controlling the main circuit section 2 of the discharge lamp lighting device 1, and has an input terminal Vdd.
The drive pulse a11 is generated based on the voltage of the lamp power detection terminal a using the voltage supplied between the stable potential terminal GND and the stable potential terminal GND as a power source, and is supplied from the output terminal Out to the gate of the FET 18.

In the discharge lamp lighting device of such an embodiment, the AC power supply voltage from the commercial AC power supply 11 is rectified by the rectification circuit 12 and the capacitor C for supplying the main circuit power is supplied.
13 is applied to the series connection of the FETs 17 and 18 by the main circuit high-voltage wiring 13 and the main circuit stable potential wiring 23, and is also supplied via the resistor R11 to the IC power supply capacitor C14 and the Zener diode Dz1.
1 and the voltage is made constant, and the IC high voltage wiring 15 and the IC stable potential wiring 25 allow the IC 16
Given to. As a result, the IC16 generates the drive pulse a11, and the drive pulse a11 is generated by the FET1.
7 is led to the connection point between the gate of No. 7 and the capacitor C16. As a result, the FETs 17 and 18 are turned on and off in opposite phases. When the FET 17 is turned on and the FET 18 is turned off, the current from the main circuit high potential wiring 13 flows into the middle point of the coil L14 via the FET 17 and the coil L13, and the current flowing into the middle point of the coil L14 is shunted. Discharge lamp 20
(C18), 21 (C19), and merge again to flow into the capacitors C70, C18, C19. FET17
Is turned off and the FET 18 is turned on, the electric charge stored in the capacitor C70 is discharged, and the current due to this discharge is passed through the discharge lamps 20 (C18) and 21 (C19), and the
4 flows into one end and the other end of the coil 4, and this current flows through the coil L14.
At the midpoint, they merge and flow into the coil L13. In this way, the FETs 17 and 18 are turned on and off by the IC 16, so that the discharge lamps 20 and 21 are started and turned on.

FIG. 2 is an explanatory view for explaining the arrangement position of the IC 16 of FIG. 1 on the substrate.

The substrate 31 is housed in, for example, the lighting device and is formed in an elongated shape. Board 31
Is divided into sections 3 and 5 along the long side direction.

In the section 3, in order to prevent a short circuit,
The main-circuit high-voltage wiring 13 and the main-circuit stable potential wiring 23 are formed on both sides of the one surface.

In the section 5, the IC stable potential wiring 25 branched from the main circuit stable potential wiring 23 is formed separately from the section 3. The control circuit unit 4 including the IC 16 between the IC stable potential wiring 25 and the main circuit stable potential wiring 23 (see FIG. 1).
(See). Although not shown, the IC high-voltage wiring 15 shown in FIG. 1 is preferably formed so that the portion in the long side direction with respect to the substrate 31 is reduced.

According to this embodiment, the IC 16 is provided between the IC stable potential wiring 25 and the main circuit stable potential wiring 23.
Since the control circuit portion 4 including the control circuit portion 4 is provided, the magnetic field applied to the control circuit portion 4 by the current (arrow 32) flowing through the stable potential wiring 23 for the main circuit and the current flowing through the stable potential wiring 25 for IC (arrow 33). Control circuit unit 4 including IC 16
Is opposite to the magnetic field applied to. Since the control circuit portion 4 is provided outside the area surrounded by the main circuit high voltage wiring 13 and the IC stable potential wiring 23, the main circuit high voltage wiring 13 is provided.
The magnetic field applied to the control circuit unit 4 by the current (arrow 34) flowing in the opposite direction and the magnetic field applied to the control circuit unit 4 by the current flowing in the IC stable potential wiring 23 (arrow 32) are in opposite directions. As a result, the magnetic field applied to the control circuit unit 4 including the IC 16 is weakened by the magnetic field generated by the main circuit stable potential wiring 23 due to the magnetic field generated by the main circuit high voltage wiring 13 and the magnetic field generated by the IC stable potential wiring 25. And can be suppressed to a low level. As a result, IC16
It is possible to prevent malfunction of the control circuit unit 4 including the above, and to provide a highly reliable discharge lamp lighting device to the user.

FIG. 3 is a circuit diagram showing a case where another embodiment of the power supply device according to the present invention is applied to a discharge lamp lighting device,
The same components as those in the conventional example of FIG. 8 are designated by the same reference numerals and the description thereof is omitted.

In FIG. 3, the difference in this embodiment is that I
A diode D63 is provided so that the cathode faces the high-potential power input terminal Vdd of the IC 66, and the diode D63 is provided between the high-potential power input terminal Vdd of the C66 and the collector of the NPN transistor Tr61. IC on the cathode side of diode D63 via resistor R63
Is connected to the high voltage wiring 65 for use. Further, instead of the capacitor C64 for supplying IC power (see FIG. 8), a capacitor C71 dedicated for supplying IC power is connected between the high potential power input terminal Vdd of IC66 and the stable potential terminal GND of IC66 to supply buffer power. Capacitor C72 for NPN
It is connected between the collector of the transistor Tr61 and the collector of the PNP transistor Tr62.

According to this embodiment, the current flowing through the resistor R63 into the main circuit high potential wiring 63 is temporarily
The capacitor C72 for buffer power supply is charged to N
PN transistor Tr61 and PNP transistor Tr6
2 flowing in series connection, while being charged in the capacitor C71 dedicated to IC power supply through the diode D63,
It flows into the high potential power input terminal Vdd of the IC 66. As a result, when the current flowing through the NPN transistor Tr61 and the PNP transistor Tr62 changes suddenly,
The current flowing from the collector of the PNP transistor Tr62 to the stable potential wiring 64 is absorbed by the capacitor C72,
It can be prevented from flowing into the stable potential terminal GND of the IC 66. As a result, the IC 66 can be prevented from malfunctioning and a highly reliable discharge lamp lighting device can be provided to the user.

In the embodiment shown in FIG. 3, the diode D63 is used.
Although the effect of preventing the current flowing through the stable potential wiring 64 from flowing into the stable potential terminal GND of the IC 66 is enhanced by providing, the capacitors C71 and C72 are distributed to appropriate values without providing the diode D63. If so, a sufficient effect can be obtained.

FIG. 4 is a constitutional view showing another embodiment of the power supply device according to the present invention. The same components as those of the conventional example of FIG. 9 are designated by the same reference numerals and their explanations are omitted. .

The DC power source 77 is provided with a predetermined distance in the direction in which the stable potential terminal GND of the IC 66 and the high voltage power source terminal Vdd are brought close to each other. The positive terminal of the DC power supply 77 is connected to the high voltage power supply terminal Vdd of the IC 66 by the IC high voltage wiring 79.
And the negative terminal of the DC power supply 77 is connected to the stable potential wiring 78.
Is connected to the stable potential terminal GND of the IC 66.

As a result, most of the IC 66 is not sandwiched between the IC high-voltage wiring 79 and the stable potential wiring 78, so that the IC 66 forms the magnetic field due to the current flowing through the IC high-voltage wiring 65 and the stable potential wiring 64. It is less likely to be affected by the magnetic field due to the current flowing in the. As a result, the IC can be prevented from malfunctioning, and a highly reliable discharge lamp lighting device can be provided to the user.

FIG. 5 is a plan view showing the specific positions of the stable potential terminal GND and the high voltage power supply terminal Vdd of the IC used in the embodiment shown in FIGS. 1 to 4.

Reference numeral 91 is an IC for controlling the discharge lamp lighting device.
In the IC 91, the package 92 is formed in a rectangular box shape when viewed from above. Eight terminals 931, 932, ... 938 are sequentially provided on one long side of the package 92. Of these terminals, the terminal 932 is the lamp power detection terminal a and the terminal 936 is the stable potential terminal GND. The terminal 937 is the output terminal OUT. Although not shown in FIGS. 1 to 4, the remaining terminals are also assigned a predetermined purpose (for example, the terminal 932 is a soft start voltage output terminal and the terminal 933 is a dimming level adjustment terminal). Eight terminals 939, 940, ... 946 are sequentially provided on the other long side of the package 92. Of these terminals, the terminal 931 is the high-voltage power supply terminal V of FIG.
It is dd. Further, although omitted in FIGS. 1 to 4, the remaining terminals are also assigned a predetermined use.

As described above, the stable potential terminal GN of the IC 91 is
Since the D and the high voltage power supply terminal Vdd are provided close to each other in the same direction of the opposite long sides of the package 92, the embodiment of FIG. 4 can be applied.

FIG. 6 is a constitutional view showing still another embodiment of the power supply device according to the present invention.

The board 40 is housed in, for example, an illuminating device and mounts various parts of the discharge lamp lighting device.
The resistors R1 and R2 are resistors R12 and R1 for voltage detection of FIG.
Equivalent to 3. The winding component 41 is the coil L1 in FIG.
1, L12 and the core 19. Control circuit unit 42
Corresponds to the control circuit unit 4 in FIG.

In the present embodiment, the winding component 41 and the control circuit unit 42 are provided in such a manner that the winding component 41 and the control circuit unit 42 are arranged close to the short sides of the substrate which face each other. Further, the lamp voltage detection wiring 43 that connects the connection point of the resistors R1 and R2 and the control circuit unit 42 is provided separately from the winding component 41.

As a result, the magnetic field generated by the winding parts 41 applied to the control circuit section 42 and the lamp voltage detection wiring 43 can be reduced, malfunctions of the IC itself and malfunctions of detection can be prevented, and reliable discharge lamp lighting can be achieved. The device can be provided to the user.

FIG. 7 is a plan view when the discharge lamp lighting device of FIG. 1 is applied to a lighting device.

In FIG. 7, reference numeral 101 is a casing of the lighting device, and inside the casing 101 is a substrate 102 provided with a circuit except the discharge lamps 20 and 21 of the discharge lamp lighting device of FIG. ing. On the outside of the housing 101, the socket 10
3, 104, 105, 106 are provided and the socket 10
The discharge lamp point 20 is attached between the terminals 3 and 104, and the circuits of the discharge lamp 20 and the substrate 102 are electrically connected via the sockets 103 and 104. Socket 1
A discharge lamp point 21 is attached between 05 and 106, and the circuit of the discharge lamp 21 and the circuit of the substrate 102 are electrically connected via the sockets 105 and 106.

With such a lighting device, the discharge lamp lighting device of FIG. 1 can be actually used.

Although the present invention is applied to the discharge lamp lighting device for lighting the discharge lamp in the embodiments shown in FIGS. 1 to 7, it may be applied to a power supply device for energizing other loads.

[0073]

According to the present invention, since the control circuit can be prevented from malfunctioning due to the current flowing through the circuit, the reliability is high, and the drive current of the control circuit can be reduced, so that an efficient power supply device and An electric lamp lighting device and a lighting device can be provided.

[0074]

[Brief description of drawings]

[0075]

FIG. 1 is a circuit diagram showing an embodiment of a power supply device according to the present invention.

[0076]

FIG. 2 is an explanatory view illustrating the arrangement position of the IC of FIG. 1 on a substrate.

[0077]

FIG. 3 is a circuit diagram showing another embodiment of the power supply device according to the present invention.

[0078]

FIG. 4 is a configuration diagram showing another embodiment of the load discharge lamp lighting device according to the present invention.

[0079]

5 is a plan view showing an IC used in the embodiment shown in FIGS. 1 to 4. FIG.

[0080]

FIG. 6 is a configuration diagram showing another embodiment of the load discharge lamp lighting device according to the present invention.

[0081]

7 is a cross-sectional view of a lighting device to which the discharge lamp lighting device of FIG. 1 is applied.

[0082]

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

[0083]

FIG. 9 is an explanatory view illustrating the arrangement position of the IC of FIG. 8 on the substrate.

[0084]

10 is an explanatory diagram showing the arrangement of paths for supplying power to the IC of FIG. 8. FIG.

[0085]

[Explanation of symbols]

 1 Discharge Lamp Lighting Device 2 Main Circuit Section 3, 5 Sections 4 Control Circuit 11 Commercial AC Power Supply 12 Rectifier Circuit 13 High Voltage Wiring for Main Circuit 15 High Voltage Wiring for IC 16 IC 17, 18 FET 20, 21, Discharge Lamp 23 Main Circuit Stable potential wiring for IC 25 Stable potential wiring for IC C14 capacitor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinya Shirata 1-48 Mita, Minato-ku, Tokyo Inside Toshiba Lighting & Technology Corporation

Claims (7)

[Claims] 1. A substrate on which first and second high potential wirings and a first stable potential wiring are formed, and a second stable potential wiring branched from the first stable potential wiring is formed, Rectifying means provided on the substrate for rectifying an AC voltage from a commercial AC power source and generating a first DC voltage between the first high potential wiring and the first stable potential wiring; A high-frequency oscillator circuit which is provided and outputs a high-frequency voltage by turning on / off a first DC voltage between the first high-potential line and the first stable-potential line with a switching element; A second DC voltage is applied to the second DC voltage using a load to which an output is supplied and a first DC voltage provided on the substrate and between the first high potential wiring and the first stable potential wiring. Direct current generated between the high potential wiring and the second stable potential wiring of the And a control circuit that uses a second DC voltage between the second high-potential wiring and the second stable-potential wiring as a power source to control ON / OFF of the switching element of the high-frequency oscillation circuit. A power supply device characterized by the above. 2. The second stable potential wiring is formed on the side opposite to the side on which the first high potential wiring is formed with the second high potential wiring as a boundary, and the control circuit is also provided with the second high potential wiring. 1
The power supply device according to claim 1, wherein the power supply device is arranged on a side opposite to a side on which the high potential wiring is formed. 3. Rectifying AC voltage from a commercial AC power supply,
Rectification means for generating a first DC voltage, a high-frequency oscillation circuit for outputting a high-frequency voltage by turning on / off the first DC voltage from the rectification means with a switching element, and the output of this high-frequency oscillation circuit are supplied. A load, a control circuit that supplies a drive signal to the switching element of the high-frequency oscillation circuit to perform on / off control of the switching element, and a path that supplies a drive signal to the switching element of the high-frequency oscillation circuit. A buffer amplifier that prevents the reverse flow of a signal, a first power supply capacitor that generates a second power supply voltage by charging a current from the rectifier circuit, and supplies the second power supply voltage to the control circuit, and a current from the rectifier circuit. And a second power supply capacitor that supplies a third power supply voltage to the buffer amplifier by charging the second power supply voltage. Power supply. 4. A high-potential power supply for supplying power to the control circuit, wherein a high-frequency oscillation circuit controlled by the control circuit turns on / off a direct-current voltage by a switching element to output a high-frequency voltage and supplies the load to a load. A power supply device characterized in that a wiring and a stable potential wiring are formed on a substrate by extending to a side of the control circuit where a power input terminal pair is provided. 5. A high frequency oscillating circuit having a winding part and controlled by a control circuit turns on a DC voltage by a switching element.
In a power supply device that outputs a high frequency voltage after being turned off and supplies it to a load, the winding device and the control circuit are separately arranged on respective sides of the board that face each other. 6. The discharge lamp lighting device according to claim 1, wherein a discharge lamp is used as the load. 7. A lighting device comprising: a lighting fixture main body; a discharge lamp provided in the lighting fixture main body; and a discharge lamp lighting device according to claim 6, which lights the discharge lamp.