JP4127264B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting apparatus using an annular fluorescent lamp.

FIG. 10 shows a circuit diagram of an inverter type lighting circuit in a conventional example, and a DC voltage obtained by voltage double rectification of an AC voltage of a commercial power source AC with diodes D ₁ and D ₂ and smoothing capacitors C ₂ and C ₃ . Is converted into a high-frequency AC voltage by an inverter circuit section 6 ′ connected in parallel to the smoothing capacitors C ₂ and C ₃ to turn on the fluorescent lamps 2 ₁ and 2 ₂ at a high frequency.

The inverter circuit section 6 ′ is turned on / off by the driver circuit 13 by the switching elements Q ₁ ′ and Q ₃ ′ that oscillate with the voltage induced on the secondary side of the transformers T ₁ and T ₂ and the control signal from the control IC 12. Switching elements Q ₂ ′ and Q ₄ ′ that are turned off, and switching elements Q ₁ ′ and Q ₂ ′ and Q ₃ ′ and Q ₄ ′ are alternately turned on and off (frequency of about 50 kHz) to generate a DC voltage Is a so-called self-excited other control system that converts a signal into a high-frequency voltage. Thus, when the switching elements Q ₂ ′ and Q ₄ ′ are on, the high frequency is relatively reduced from the smoothing capacitors C ₂ and C ₃ through the fluorescent lamps 2 ₁ and 2 ₂ and the switching elements Q ₂ ′ and Q ₄ ′. When a large current flows and the switching elements Q ₁ ′ and Q ₃ ′ are on, high frequency comparison is performed from the capacitors C ₅ and C ₈ via the switching elements Q ₁ ′ and Q ₃ ′ and the fluorescent lamps 2 ₁ and 2 _2. Large current flows (see arrows in FIG. 10).

In this conventional example, since the input current distortion from the commercial power supply AC is improved by the choke coils L ₁ and L ₂ , a large choke coil using a silicon steel plate is required, and voltage doubler rectification is performed. In addition, large capacitors having a large capacity are used as the smoothing capacitors C ₂ and C ₃ . Further, since the fluorescent lamps 2 ₁ and 2 ₂ are individually turned on by the inverter circuit section 6 ′, the control IC 12 and peripheral components necessary for the operation of the control IC 12 and the switching element Q ₁ ′ are provided. The mounting area of the driver circuit 13 to be driven on the printed circuit board increases.

FIG. 11 shows a lighting circuit block formed by mounting circuit components constituting the lighting circuit on a substantially arc-shaped printed board 3. As shown in the figure, since the choke coils L ₁ and L ₂ and the smoothing capacitors C ₂ and C ₃ require large components, they are mounted in the space in the width direction of the printed circuit board 3. In addition, because of the individual lighting system, the circuit components constituting the peripheral circuit of the inverter circuit section 6 ′ and the control IC 12 are also mounted using the full space of the printed circuit board 3. Therefore, the area of the high-frequency current loop of the inverter circuit section 6 ′ that supplies power to the fluorescent lamps 2 ₁ and 2 ₂ also increases with the mounting space of the printed circuit board 3. Further, a control IC 12 is mounted between the smoothing capacitors C ₂ and C _{3 serving as} the power source of the inverter circuit section 6 ′ and circuit components constituting the inverter circuit section 6 ′, and the ground of the smoothing capacitor C ₃ and the control IC 12 are mounted. for ground and is not in a positional relationship facing to each other, most stable to ground pattern wiring of the control IC12, which is connected to the smoothing capacitor C ₃ of the ground is increased, also the inverter circuit from the smoothing capacitor C _2, C ₃ Circuit components are mounted and arranged such that a large current loop for supplying power to 6 'intersects the control IC 12.
Japanese Patent Laid-Open No. 6-290628

(First problem in the conventional example)
Since in the above prior art can not implement a ground control IC12 in the vicinity of the smoothing capacitor C ₃ is a ground for the most stable on the circuit, the variation of the potential is caused by routing of the wiring pattern to ground of the control IC12. Further, since the smoothing capacitors C ₂ and C ₃ supply power as the power source of the inverter circuit section 6 ′, a large current flows in the vicinity of the control IC 12, so that the potential fluctuation of the weak signal line around the control IC 12. May occur. From these facts, considering the stable operation of the circuit, the circuit components should be arranged so that the weak signal line around the control IC 12 and the large current loop do not cross each other at the shortest possible distance from the most stable ground to the ground of the control IC 12. It must be mounted on the printed circuit board 3.

(Second problem in the conventional example)
In the shape of the printed circuit board 3 in the above conventional example, the wiring length is shorter when the wiring to the fluorescent lamps 2 ₁ and 2 ₂ is formed at the inner periphery than at the outer periphery. However, the circuit components constituting the inverter circuit section 6 ′ However, since the space in the width direction of the printed circuit board 3 is integrally mounted, the area of the large current loop flowing through the inverter circuit section 6 ′ naturally increases. In general, it is known that the level of noise generated from an inverter circuit increases as the area of a high-frequency current loop flowing through the inverter circuit increases. For this reason, in order to reduce the noise generated from the inverter circuit section 6 ′, the circuit components must be mounted on the printed circuit board 3 so as to reduce the area of the high-frequency current loop flowing through the inverter circuit section 6 ′.

(Third problem in the conventional example)
By the way, some lighting fixtures can be remotely controlled to turn on / off, dimming, etc. using a remote control transmitter, but in the case of such lighting fixtures with a remote control function, they are transmitted from the remote control transmitter. It is necessary to provide a remote control circuit unit that receives and processes the signal to control the operation of the lighting circuit block. Thus, when a remote control circuit unit is added to a lighting circuit block that does not have a remote control function as in the above-described conventional example, there is no space for mounting circuit components constituting the remote control circuit unit 10 on the printed circuit board 3. Therefore, it is necessary to make the mounting design of printed circuit boards and circuit components on the printed circuit boards completely different. For this reason, it is necessary to design a troublesome printed circuit board from scratch, and the problem that the printed circuit board design takes about twice as long depending on the presence or absence of the remote control function for the same lighting fixture, There is also the problem of increased costs.

  The inventions of claims 1 and 2 have been made in view of the first problem in the above-described conventional example, and an object of the invention is to provide a lighting apparatus capable of operating the inverter circuit section stably. There is.

  The invention of claim 3 was made in view of the second problem in the conventional example described above, and its object is to provide a lighting apparatus capable of reducing noise generated from the inverter circuit section. is there.

  The invention of claim 4 was made in view of the third problem in the conventional example described above, and the object thereof is illumination that can cope with the presence or absence of a remote control function with the same printed circuit board design. To provide an instrument.

In order to achieve the above-mentioned object, the invention according to claim 1 is an annular fluorescent lamp and a circuit component constituting an inverter-type lighting circuit for lighting the fluorescent lamp, and the circuit component formed in a substantially arc shape. In a lighting fixture comprising a lighting circuit block made of a printed circuit board on which is mounted, a smoothing capacitor having polarity among the circuit components and serving as an input power source for the lighting circuit, and a control for controlling the operation of the lighting circuit The IC is mounted on the printed circuit board in close proximity so that the negative terminal of the smoothing capacitor, which is a terminal connected to each other via the pattern wiring, and the GND of the control IC are in a mutually opposing positional relationship. The pattern wiring length of the ground of the control IC can be shortened, and the lighting circuit can be stably operated by suppressing the fluctuation of the potential due to the routing of the pattern wiring.

  The invention of claim 2 is characterized in that, in the invention of claim 1, a step-up chopper circuit is provided on the input side of the lighting circuit, and a silicon steel plate is used to improve input current distortion from a commercial power source. The large choke coil and the large capacity and large capacitor are no longer necessary, and the printed circuit board and the like can be downsized.

  In order to achieve the above object, according to a third aspect of the present invention, in the first aspect of the invention, a circuit component in which a relatively large current flows is mounted on the inner peripheral side of the printed circuit board. As a feature, noise can be reduced by reducing the current loop area through which a relatively high frequency current flows.

  According to a fourth aspect of the present invention, there is provided a remote control circuit unit that receives and processes a signal transmitted from a remote control transmitter and controls the operation of the lighting circuit block according to the first aspect of the invention. The printed circuit board is provided with a space in which at least a part of the circuit components to be configured can be mounted. The same printed circuit board design can be used for the presence or absence of the remote control function. The time required can be shortened.

  According to a fifth aspect of the present invention, in the first aspect of the invention, the smoothing capacitor and the control IC are mounted on the printed circuit board so that the taller circuit component is located on the inner peripheral side. The circuit component and the case are less likely to interfere with each other in the height direction, and can be mounted closer to the outer periphery of the printed circuit board, thereby improving the mounting efficiency.

  According to a sixth aspect of the invention, in the first aspect of the invention, a step-up chopper circuit is provided on the input side of the lighting circuit, and among the circuit components, a circuit component in which a relatively large current flows is included in the printed circuit board. A space where at least a part of the circuit components constituting the remote control circuit unit that is mounted on the peripheral side, receives and processes the signal transmitted from the remote control transmitter, and controls the operation of the lighting circuit block can be mounted is printed A large-sized choke coil using a silicon steel plate and a large-capacity large-sized capacitor are not required to improve input current distortion from a commercial power supply, and the printed circuit board can be downsized. It is possible to reduce the noise by reducing the area of the current loop through which a relatively large high-frequency current flows. And can be associated with the same printed circuit board design, it is possible to shorten the time required for a printed circuit board design.

Among the circuit components constituting the inverter type lighting circuit for lighting the annular fluorescent lamp, a smoothing capacitor serving as an input power source for the lighting circuit and a control IC for controlling the operation of the lighting circuit are connected via a pattern wiring. Since the negative terminal of the smoothing capacitor, which is a terminal connected to each other, and the GND of the control IC are mounted close to each other so as to face each other , the pattern wiring length of the ground of the control IC is The lighting circuit can be shortened, and the lighting circuit can be stably operated by suppressing the fluctuation of the potential due to the routing of the pattern wiring.

(Embodiment 1)
FIG. 1 is a plan view showing a lighting circuit block according to Embodiment 1 of the present invention, and FIG. 2 is a circuit diagram of the lighting circuit. Since the basic configuration of the present embodiment is the same as that of the conventional example, common portions are denoted by the same reference numerals and description thereof is omitted. First, the lighting circuit in the present embodiment will be described with reference to FIG. The lighting circuit of this embodiment includes line filters LF ₁ and LF ₂ for reducing power supply feedback noise, a diode bridge DB, a chopper circuit unit 5 and an inverter circuit unit 6.

The chopper circuit unit 5 includes a capacitor C ₂ , an inductance L ₁ , a diode D ₅ , a switching element Q ₁ , and a smoothing capacitor C _{3. The} chopper circuit unit 5 is boosted by controlling the switching element Q ₁ by the control IC 7. The DC voltage is output to the inverter circuit unit 6 at the next stage. Reference numeral 9 denotes a power supply circuit for obtaining an operating power supply Vcc for the control IC 7.

The inverter circuit unit 6 includes a smoothing capacitor C ₄ , a pair of switching elements Q ₂ and Q ₃ , a driver circuit 8 that drives the switching elements Q ₂ and Q ₃ , a resonance circuit including capacitors C ₅ and C _7, and an inductance L ₂ . A resonance circuit including capacitors C ₆ and C ₈ and an inductance L ₃ is provided, and a pair of switching elements Q ₂ and Q ₃ are alternately turned on and off at a high frequency (for example, a frequency of 50 kHz) by the control IC 7, thereby The direct-current voltage input from the circuit unit 5 is converted into a high-frequency alternating voltage, and the two fluorescent lamps 2 ₁ and 2 ₂ are turned on at a high frequency. That is, the lighting circuit in the present embodiment drives and controls the switching element Q ₁ of the chopper circuit unit 5 and the switching elements Q ₂ and Q ₃ of the inverter circuit unit 6 with the same control IC 7. two fluorescent lamps 2 _1, 2 ₂ to high frequency lighting, an inverter batch lighting circuit of a so-called chopper interlocking separately excited, on the switching device to Q ₁ chopper circuit 5 is the same frequency as the oscillation frequency of the inverter circuit 6 Turned off.

In the above lighting circuit, since the input current distortion from the commercial power supply AC is improved by the chopper circuit unit 5, a large choke coil using a silicon steel plate as in the conventional example or a large capacitor with a large capacity is not required. The printed circuit board 3 and the like can be downsized. In addition, since the two fluorescent lamps 2 ₁ and 2 ₂ are lit together by the single inverter circuit unit 6, the control IC 7 and the control IC 7 are compared with the individual lighting type as in the conventional example. There is an advantage that the mounting area for the printed circuit board 3 such as the peripheral components necessary for operation and the driver circuit 8 that drives the switching elements Q ₂ and Q ₃ can be reduced, and the degree of freedom in the mounting design of the printed circuit board 3 can be increased. .

The circuit components constituting the lighting circuit as described above are mounted on a substantially arc-shaped printed board 3 as shown in FIG. In the present embodiment, large components (inductances L _{1 to} L ₃ , switching elements) through which a relatively large current (see arrows in FIG. 2) flows among circuit components constituting the chopper circuit unit 5 and the inverter circuit unit 6. Q 1 _{to Q 3,} since the mounted capacitor C ₃ -C ₆ or the like) on the inner peripheral side of the printed circuit board 3, generated from the inverter circuit 6 to reduce the current loop area large high-frequency current flows relatively Noise can be reduced.

Further, since the grounds of the smoothing capacitors C ₃ and C ₄ that are the most stable grounds in the circuit and the ground of the control IC 7 are mounted on the printed circuit board 3 so as to face each other and close to each other (see FIG. 1), the pattern wiring length of the ground of the control IC 7 can be shortened as much as possible, and the lighting circuit can be stably operated by suppressing the fluctuation of the potential due to the routing of the pattern wiring. Note that the smoothing capacitors C ₃ and C ₄ and the control IC 7 may face each other on either the component mounting surface side or the solder surface (non-mounting surface) side. Here, as shown in FIG. 3, the taller circuit components (for example, the smoothing capacitors C ₃ and C ₄ ) of the smoothing capacitors C ₃ and C ₄ and the control IC 7 are positioned on the inner peripheral side. When mounted on the printed circuit board 3, the circuit component and the case 1 are less likely to interfere with each other in the height direction, and can be mounted closer to the outer periphery of the printed circuit board 3, thereby improving the mounting efficiency.

Although higher frequency a large current flows through the smoothing capacitor C _3, C _4, by connecting between the ground control IC7 of the smoothing capacitor C _3, C ₄ ground as shown in FIG. 2, the control IC7 A large current does not flow into the ground and there is no potential fluctuation, so that a more stable circuit operation can be realized. By the way, in the present embodiment, the power supply connector 11 to which the commercial power supply AC is connected, the line filter, by using surface-mounted components for the small-capacity circuit components that do not flow a large current as described above. An empty space S is provided on the outer peripheral side from the mounting position of LF ₁ , LF ₂ , and diode bridges D _{1 to} D ₄ . That is, even when the remote control circuit unit 10 that receives and processes the signal transmitted from the remote control transmitter and controls the operation of the lighting circuit block is added (see FIG. 2), the remote control is added to the empty space S. Since circuit components constituting the circuit unit 10 can be mounted, the same printed circuit board 3 can be used for the presence or absence of the remote control function. As a result, it is possible to reduce the time required for designing a troublesome printed circuit board. In addition, the through hole provided in the printed circuit board 3 may be shared, and a part of the pattern wiring may be distinguished depending on the presence or absence of the remote control function. Since the circuit configuration of the remote control circuit unit 10 is well known in the art, illustration and description thereof are omitted.

(Embodiment 2)
4 is a plan view showing a lighting circuit block according to Embodiment 2 of the present invention, and FIG. 5 is a circuit diagram of the lighting circuit. Since the basic configuration of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted, and only portions that are characteristic of the present embodiment are described.

In the present embodiment, the control IC 7 ₁ to control on and off the switching element to _{Q 1} chopper circuit 5, and a control IC 7 ₂ to control turn on and off the switching element _Q 2, _{Q 3} of the inverter circuit 6 provided separately, with each control _{IC 7} 1, _{7 2} of the ground and the ground of the smoothing capacitor _C 3, _{C 4} mounted on the printed circuit board 3 so as to be near and at the opposing positional relationship, the control _{IC 7} 1, it is characterized in that the 7 _second ground in that connected between the smoothing capacitor C _3, C ₄ ground.

And the control IC 7 ₁ to thus on-off control the switching elements to Q ₁ chopper circuit 5, the switching elements Q of the inverter circuit 6 _2, Q ₃ to control the on-off control IC 7 ₂ and the individual Even with the circuit configuration provided, the same effects as in the first embodiment can be obtained.

(Embodiment 3)
FIG. 6 is a plan view showing a lighting circuit block according to Embodiment 3 of the present invention, and FIG. 7 is a circuit diagram of the lighting circuit. Since the basic configuration of the present embodiment is the same as that of the second embodiment, common portions are denoted by the same reference numerals and description thereof is omitted, and only portions that are characteristic of the present embodiment will be described.

In the present embodiment, the control IC 7 ₁ to on-off control the switching elements to Q ₁ chopper circuit 5, a control I7 ₂ for controlling the oscillation frequency of the inverter circuit 6, the switching elements of the inverter circuit 6 Q _{2, Q 3} on-off control to comprise individually a control IC 7 _3, and the vicinity in a positional relationship where the ground for each control _{IC 7} 1 to _7-3 ground and a smoothing capacitor _C 3, _{C 4} are opposed And the ground of the control ICs 7 _{1 to} 7 ₃ is connected between the grounds of the smoothing capacitors C ₃ and C ₄ .

And the control IC 7 ₁ to thus on-off control the switching elements to Q ₁ chopper circuit 5, a control I7 ₂ for controlling the oscillation frequency of the inverter circuit 6, the switching element Q ₂ of the inverter circuit 6 , be a circuit configuration and a control IC 7 ₃ for on-off control of the Q ₃ individually, it is possible to achieve the same effect as the embodiment 1 or 2.

(Embodiment 4)
FIG. 8 is a plan view showing a lighting circuit block according to Embodiment 6 of the present invention, and FIG. 9 is a circuit diagram of the lighting circuit. Since the basic configuration of the present embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted, and only portions that are characteristic of the present embodiment are described.

In the present embodiment, the transformer T to the gate of the switching element Q ₂ on the high potential side of the inverter circuit 6, resistors R1, by connecting the zener diode ZD causes self-oscillate, control the switching element Q ₃ on the low potential side On-off control is performed by the IC 7 'for the control, and the control IC 7' is mounted on the printed circuit board 3 so that the ground of the control IC 7 'faces the ground of the smoothing capacitors C ₃ and C ₄ and is close to the ground. It is characterized in that the ground of the IC 7 ′ is connected between the grounds of the smoothing capacitors C ₃ and C ₄ .

  Thus, even when the inverter circuit unit 6 is a self-excited other-controlled inverter circuit, the same effects as in the first embodiment can be obtained.

3 is a plan view showing a lighting circuit block according to Embodiment 1. FIG. It is a circuit diagram which shows a lighting circuit same as the above. It is side surface sectional drawing which shows the principal part same as the above. 6 is a plan view showing a lighting circuit block according to Embodiment 2. FIG. It is a circuit diagram which shows a lighting circuit same as the above. 6 is a plan view showing a lighting circuit block according to Embodiment 3. FIG. It is a circuit diagram which shows a lighting circuit same as the above. FIG. 6 is a plan view showing a lighting circuit block according to a fourth embodiment. It is a circuit diagram which shows a lighting circuit same as the above. It is a circuit diagram which shows the lighting circuit of a prior art example. It is a top view which shows the lighting circuit block same as the above.

Explanation of symbols

2 Fluorescent lamp 3 Printed circuit board 7 Control IC
C ₃ and C ₄ smoothing capacitors

Claims (6)

An annular fluorescent lamp, a circuit component that constitutes an inverter-type lighting circuit for lighting the fluorescent lamp, and a lighting circuit block that is formed in a substantially arc shape and includes a printed circuit board on which the circuit component is mounted. In a lighting fixture, a smoothing capacitor having polarity among the circuit components and serving as an input power source for the lighting circuit and a control IC for controlling the operation of the lighting circuit are connected to each other via a pattern wiring. A lighting apparatus, wherein a negative terminal of a smoothing capacitor and a GND of a control IC are mounted on the printed circuit board so as to be in a positional relationship facing each other .   2. A lighting apparatus according to claim 1, wherein a step-up chopper circuit is provided on the input side of the lighting circuit.   2. The lighting apparatus according to claim 1, wherein a circuit component through which a relatively large current flows among the circuit components is mounted on the inner peripheral side of the printed circuit board.   The printed circuit board is provided with a space in which at least a part of circuit components constituting a remote control circuit unit that receives and processes a signal transmitted from the remote control transmitter and controls the operation of the lighting circuit block can be mounted. The lighting fixture according to claim 1.   2. The lighting apparatus according to claim 1, wherein the smoothing capacitor and the control IC are mounted on the printed circuit board such that a taller circuit component is positioned on the inner peripheral side.   A step-up chopper circuit is provided on the input side of the lighting circuit, and a circuit component in which a relatively large current flows among the circuit components is mounted on the inner peripheral side of the printed circuit board, and is transmitted from a remote control transmitter. 2. The printed circuit board is provided with a space in which at least a part of a circuit component constituting a remote control circuit unit that receives and processes the signal and controls the operation of the lighting circuit block can be mounted. Lighting fixtures.

Images